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What To Do And See In Thailand 3-week Trip? Review By Mrs Helene

3 weeks in Thailand was a wonderful opportunity for me to dive into the heart of a fascinating country, where ancient traditions blend beautifully with a gentle way of life. From the golden temples of Bangkok to the stunning beaches of the South, and through the peaceful regions of the North, each stop on this Thailand trip revealed a new facet of the "Land of Smiles". Curious to know more? Join me on this Thailand 3-week itinerary filled with culture, nature, and relaxation, is one I’m excited to share with you through my Thailand 3-week trip, along with some practical travel tips that I hope will inspire your own future adventure. Of course, a big thank you to AUTOUR ASIA, a Thailand travel agency, for allowing me to experience this journey in the best possible way, with an itinerary perfectly tailored to my interests and pace.

I. Why choose a Thailand 3-week itinerary?

Travelling around Thailand for 3 weeks was the perfect way to experience the full beauty and diversity of this incredible country. During this Thailand trip, I felt the vibrant energy of Bangkok, relaxed on the paradise beaches of the South such as Koh Tao, Koh Lanta, and Railay, and explored the rich culture and nature of the North in Chiang Mai and Chiang Rai.

This Thailand 3-week itinerary offered the perfect balance between exploration, relaxation, and cultural experiences. I visited iconic landmarks while also enjoying peaceful, hidden moments. Over 21 days in Thailand, I wandered through lush jungles, went snorkeling to admire colorful coral reefs, discovered ethnic villages, and watched breathtaking sunsets by the sea.

Spending 3 weeks in Thailand wasn’t just a trip, it was a chance to slow down, feel deeply, and fall even more in love with this warm and welcoming country.

II. My Thailand 3-week itinerary - What to do and see?

1. Bangkok (3 days)

My 3-week trip to Thailand began in Bangkok, the vibrant capital city located along the Chao Phraya River. I took an early morning flight and headed straight to Hotel Clover Asoke, one of the best 4-star hotels in Bangkok, to settle in and rest a bit before starting my exploration. This city was the perfect starting point, where the past and present intertwined in every street and temple, offering an energetic yet welcoming atmosphere.

Day 1-2: Discovering Bangkok

On the first afternoon of my Thailand 3-week trip, I explored the historic district of Rattanakosin, the cultural heart of Bangkok. I visited Wat Pho with its impressive Reclining Buddha, the Grand Palace, and Wat Phra Kaew, home to the famous Emerald Buddha. Wondering what to do in Thailand in 3 weeks? After a riverside lunch, I took the Orange Flag boat to cruise along the Chao Phraya River and admired Wat Arun glowing in the sunset. In the evening, I wandered through Bangkok street food areas, tasting pad thai, som tam, and mango sticky rice, must-try specialties in Bangkok.

The next morning, I went to the Khlong Lat Mayom Floating Market for breakfast on a boat and to enjoy the peaceful atmosphere of Bangkok’s outskirts. At noon, I returned to the city to visit Chatuchak Market, a true shopping paradise. Later, I treated myself to a traditional Thai massage before heading to Chinatown Bangkok (Yaowarat Road) in the evening. The glowing red signs, the tempting aromas of street food, and the fusion of Thai and Chinese cultures fascinated me. I ended the day with a cocktail at a rooftop bar, overlooking the glittering Chao Phraya River, a must-do in Thailand.

Day 3: Excursion to Kanchanaburi

On the third day, I took a train from Bangkok to Kanchanaburi. The ride, which lasted about 2.5 hours, was a peaceful escape from the city’s bustle. Wondering what to do in Kanchanaburi in 1 day? I began with the iconic Bridge over the River Kwai, a powerful symbol of World War II. Then I visited the Thailand-Myanmar Railway Museum, one of Kanchanaburi’s top places to visit, and the nearby War Cemetery, both deeply moving reminders of the "Death Railway" era.

In the afternoon, I visited the Erawan Waterfalls, a natural masterpiece of seven tiers with emerald-blue waters. The refreshing water, the birdsong, and the pure breeze made me forget all fatigue, leaving me with a sense of freedom and joy. I returned to Bangkok in the late afternoon, ending these 3 days in Bangkok with both peace and excitement for the next part of my Thailand travel itinerary3 weeks.

2. Koh Tao in the Gulf of Thailand islands (4 days)

If you’re looking for a peaceful stop during your 3 weeks in Thailand, Koh Tao is the perfect choice. The island is famous for its white sandy beaches and crystal-clear turquoise waters, a true paradise for sea and diving lovers. I took a flight from Bangkok to Koh Samui, then a 2-hour ferry to reach Koh Tao. After lunch, I checked into Assava Diving Koh Tao, located near Chalok Baan Kao Bay, a convenient area to explore the island’s southern part. These 4 days in Koh Tao fit perfectly into my Thailand 3-week itinerary, offering the ideal balance between relaxation and adventure.

Day 4-5: Exploring the South and East of Koh Tao

What to do in Thailand in 3 weeks? On my first afternoon in Koh Tao, I hiked up to the John Suwan Viewpoint, the panoramic view over the whole island was breathtaking and absolutely worth the climb. Afterward, I headed to Freedom Beach, a quiet stretch of soft sand and crystal-clear water, ideal for relaxing after a long trip. In the evening, I enjoyed fresh seafood and a cocktail at one of the cozy seaside bars in Chalok Bay.

The next morning, I went snorkeling at Shark Bay, known for its colorful coral reefs. I was lucky to spot a few small Blacktip Reef Sharks swimming nearby. After a coffee break at a local café, I continued to Jun Juea Beach (Aow Jun Juea). At first, I was hesitant, but the wild beauty and clear water quickly made me fall in love with the place. Though the path down is steep, it’s perfect for peace and quiet.

In the afternoon, I explored Tanote Bay on the island’s eastern side. I went snorkeling again, admired vibrant coral formations, and watched a stunning sunset over the water. Travelling around Thailand for 3 weeks truly allows you to experience both calm and excitement. Even though I didn’t try it, many travelers were cliff jumping there, a must-visit in Thailand for thrill seekers and adventurers.

Day 6: Discovering the Central Beaches of Koh Tao

What to do on a Thailand trip? After 2 days exploring the southern part of the island, I moved to Sairee Beach, the liveliest beach in central Koh Tao. Unlike the peaceful south, this area is full of youthful and dynamic energy.

I went snorkeling, swimming, and even tried paddleboarding for the first time in a short class - one of the unique experiences during my 3 weeks in Thailand. Gliding over the calm waters and watching the sunset was a romantic and unforgettable moment. In the evening, I dined at Fizz Beach Lounge and ended the day with a relaxing seaside Thai massage.

Day 7: Exploring Koh Nang Yuan

During my 3 weeks in Thailand, visiting Koh Nang Yuan was an absolute must. This small archipelago consists of three islands connected by a strip of white sand surrounded by turquoise waters. I took a short 15-minute boat ride from Sairee Beach to get there. At Japanese Garden, I went snorkeling, admired the coral reefs, and spotted a few adorable pufferfish. Then, I hiked up to the viewpoint for a panoramic view of the islands, the climb took only 15 minutes, but the scenery of sea and sky was simply spectacular.

Wondering what to do in Thailand ? In the afternoon, I returned to Koh Tao to watch the sunset over the water, as fishing boats gently sailed back to the harbor. These four peaceful and memorable nights in Koh Tao gave me time to relax and recharge before continuing my Thailand 3-week itinerary.

3. Khao Sok National Park (3 days)

Day 8: Visiting Khao Sok Village and Night Safari

I continued my Thailand 3-week trip by heading to Khao Sok National Park, famous for its ancient tropical rainforest. From Koh Tao, I took a ferry to Surat Thani, followed by a minivan ride to Khao Sok Village, a journey of about 6.5 hours. The lush green mountains and fresh air made the trip pleasant. I stayed at Our Jungle House, a unique eco-lodge featuring treehouses and bungalows hidden deep in the forest. The natural atmosphere, friendly service, and delicious food made me feel completely immersed in the jungle. I wished I could stay even longer to explore this magical place.

In the evening, I joined a night safari with a local guide, one of the best things to do during a Thailand travel itinerary 3 weeks. With flashlights in hand, we walked through the forest and spotted a variety of nocturnal creatures such as spiders, lizards, frogs, civets, and even slow lorises. Spending 2 hours in this wild jungle allowed me to witness the forest’s vibrant nightlife while feeling the calm and mystery of Khao Sok National Park. This unforgettable adventure added a special touch to my 21 days in Thailand.

Day 9-10: Exploring Cheow Lan Lake

On the ninth day, as part of my 3-week trip around Thailand, I dedicated the entire day to exploring the stunning Cheow Lan Lake. After a brief stop at the local market, I headed to Ratchaprapha Pier and boarded a long-tail boat to cruise over turquoise waters surrounded by majestic limestone mountains. This part of my Thailand 3-week itinerary was a true highlight, a blend of nature, peace, and breathtaking scenery.

Our first stop was Guilin Rocks, where the limestone formations reflect beautifully on the water’s surface. Then, I arrived at a floating house and settled into a simple yet cozy bungalow for lunch. Later, I hiked to the Coral Cave, a fascinating spot filled with striking stalactites and stalagmites. In the afternoon, I swam and kayaked freely on the calm lake, ending the day watching the sun set over the water, a magical and serene moment.

The next morning, I woke up early for a peaceful kayak ride at sunrise. The golden light shimmering on the lake, the birdsong, and the distant sounds of the jungle created a tranquil atmosphere. After breakfast, I took one last swim and soaked in the fresh air before leaving the floating house. On the way back to Ratchaprapha Pier, I once again admired the limestone cliffs and clear waters, closing two wonderful days of exploration at Cheow Lan Lake, a quiet and memorable experience within Khao Sok National Park.

This time at Cheow Lan Lake is an essential highlight for anyone planning to visit Thailand in 3 weeks and wishing to discover the country’s incredible natural beauty through a Thailand travel itinerary 3 weeks.

4. The Andaman Islands (6 days)

Day 11-13: Discovering Railay and Phi Phi Island

Travelling around Thailand for 3 weeks, I took a minivan to Krabi, then a boat to the Railay Peninsula, accessible only by sea. After checking into Bhu Nga Thani Resort & Villas, located near Railay East Beach, I enjoyed a peaceful walk along the soft sandy shore and watched a stunning sunset over the Andaman Sea.

On my second day in Railay, part of my 3-week trip to Thailand, I started the morning relaxing on Phra Nang Beach, then explored Phra Nang Cave and learned about the local legends surrounding it. In the afternoon, I took on the challenge of rock climbing in Railay, a paradise for adventure lovers. Hiking up to the East Railay Viewpoint and discovering Princess Lagoon was tough but rewarding, the panoramic view over the bay was absolutely breathtaking. In the evening, I returned to my hotel for a delicious seafood dinner by the beach, enjoying the cool ocean breeze.

Continuing my travel around Thailand, the next morning I left Railay by speedboat to Koh Phi Phi Don, about a 40-minute trip. I climbed to Viewpoint 3 to watch the sunrise, then took a boat to Maya Bay, made famous by the movie The Beach. I continued to Pileh Lagoon, where the clear emerald water mirrors the surrounding limestone cliffs. In the afternoon, I went kayaking from Monkey Beach to Nui Beach, discovering serene, untouched spots. Around 5 p.m, I returned by speedboat to Railay, ending an incredible day at Koh Phi Phi with a magnificent sunset over the sea.

Day 14-16: Exploring Koh Lanta

I left Railay and took a speedboat to Koh Lanta, the tranquil gem of the Andaman Sea. I stayed at Clean Beach Resort, near Klong Nin Beach. The fresh air and laid-back rhythm instantly helped me unwind. That afternoon, I swam, strolled along the beach, and watched the sunset from Diamond Cliff, a magical moment over the glistening sea.

On the next morning of my Thailand 3-week trip, I joined a kayak excursion through the Tung Yee Peng mangrove forest, one of the highlights of my 3 weeks in Thailand. Gliding under the canopy of trees, I spotted birds, crabs, and a few monkeys while learning about the lives of the local villagers. After kayaking, I enjoyed a seafood lunch at a small restaurant hidden in the mangroves, peaceful, authentic, and close to nature. In the afternoon, I rented a scooter to explore Klong Khong Beach and visit Lanta Old Town, a charming seaside village with wooden houses, cozy cafés, and floating seafood restaurants. The calm atmosphere and warm-hearted locals made it easy to embrace the island’s relaxed pace of life.

The following day, I joined a Half-Day Four Islands Tour, another memorable part of my Thailand 3-week itinerary. The first stop was Koh Muk to explore the famous Emerald Cave. Wearing a life jacket, I swam through an 80-meter tunnel guided only by the light of our guide’s torch. When the cave opened up, I found a hidden beach surrounded by cliffs and greenery, with crystal-clear water and soft white sand, a truly magical moment.

Next, the boat took us to Koh Kradan, where we snorkeled and enjoyed a Thai buffet lunch on the beach. Then, at Koh Chuak, I continued snorkeling and discovered marine life, though this stop felt less impressive. Finally, we arrived at Koh Ngai, a quiet island with no roads or shops, the perfect place to relax on a deserted beach, listen to the gentle waves, and enjoy pure tranquility. Immersing myself in such pristine nature was the perfect way to end my Thailand trip.

In the late afternoon, I left Koh Lanta and took a two-hour van ride back to Krabi for the night. That evening, I wandered around the Krabi Town Night Market, enjoyed grilled seafood, and soaked up the lively local atmosphere. These days spent on the Andaman Islands were truly among the highlights of my Thailand travel itinerary 3 weeks, combining breathtaking scenery, adventure, and the peaceful rhythm of island life.

5. Northern Thailand (5 days)

Day 17–19: Exploring Chiang Mai

I took the morning flight from Krabi to Chiang Mai at 10:30 a.m. and arrived early in the afternoon. After checking into BED Nimman, a comfortable 3-star hotel in Chiang Mai, I began exploring Chiang Mai’s most iconic temples. Wondering what to do on a Thailand trip? I visited Wat Chedi Luang and Wat Phra Singh, two stunning examples of classic Lanna architecture. In the evening, I strolled through the Sunday Night Market, a lively maze of food stalls and local handicrafts buzzing with energy.

The next day of my 3 days in Chiang Mai was dedicated to the Doi Inthanon National Park, known as the "Roof of Thailand". This Chiang Mai must-visit features lush forests, scenic hiking trails, and majestic waterfalls like Wachirathan and Mae Klang. I also stopped by the twin royal pagodas — Phra Mahathat Naphamethanidon and Phra Mahathat Naphaphonphumisiri, standing elegantly above the clouds with breathtaking mountain views.

On the third day of my Thailand 3-week itinerary, I visited Doi Suthep, the city’s most sacred temple, perched high above Chiang Mai and offering a panoramic view of the city below. In the afternoon, I joined a Thai cooking class to learn how to prepare authentic local dishes, truly one of the best things to do in Chiang Mai. The day ended perfectly with a relaxing Thai massage and a traditional dinner, rounding off an unforgettable experience on my Thailand 3-week trip.

Day 20: A day trip to Chiang Rai

As part of my Thailand 3-week itinerary, the next morning, I left Chiang Mai for Chiang Rai, a region known for its unique and artistic temples in northern Thailand. What to do in Chiang Rai? My first stop was the White Temple (Wat Rong Khun), a dazzling all-white masterpiece with mirrored mosaics, symbolizing purity and the deep spiritual roots of Thai Buddhism.

Wondering what to do in Thailand? In the afternoon, I headed to the Golden Triangle, where Thailand, Laos, and Myanmar meet. From this vantage point, the Mekong River beautifully winds between the borders. On my way back, I visited the Karen Long Neck Village, one of the most famous ethnic villages near Chiang Mai, offering a glimpse into their traditional lifestyle and customs. It was a deeply moving experience and one of the highlights of my 21 days in Thailand. I returned to Chiang Mai that evening, ready to continue my journey to Pai the next morning.

Day 21: Discovering Pai

During my 3 weeks in Thailand, I couldn’t miss Pai, a charming mountain town in Mae Hong Son province. The winding road with over 700 curves was both thrilling and scenic. Once in Pai, I wandered across the Kho Ku So bamboo bridge, stretching through lush green rice fields, and breathed in the fresh mountain air.

In the afternoon, I visited Mo Paeng Waterfall for a refreshing swim and relaxation. What to do in Thailand? Before leaving Pai, I made sure to stop by the Pai Canyon, one of must-see in Mae Hong Son, to watch the sunset over the valley. The golden light over the rugged landscape created a magical atmosphere. That evening, I returned to Chiang Mai for my final night, ending my journey through northern Thailand with unforgettable memories.

III. Practical tips for a 3-week trip to Thailand

1. When to visit Thailand?

My Thailand 3-week itinerary took place from late November to mid-December, one of the best time to visit Thailand. The weather was wonderfully pleasant: mild sunshine, little rain, and dry air. It’s the perfect period to explore the cultural cities in the north like Chiang Mai or Chiang Rai, while still enjoying relaxing days on southern beaches such as Koh Tao, Koh Lanta, or Railay.

Wondering what to do in Thailand? With ideal weather conditions, you can enjoy all kinds of outdoor activities, from jungle trekking and visiting ethnic villages to snorkeling among coral reefs. However, this period is also Thailand’s high tourist season, meaning higher hotel prices and limited availability, especially in popular destinations. My advice: book your hotels, ferry tickets, and transportation in advance to avoid surprises and make the most of your Thailand 3-week trip.

2. How to get around Thailand?

During my 3 weeks in Thailand, I used various means of transportation depending on the region: flights between Bangkok, Chiang Mai, and Krabi; and boats or ferries to reach the islands like Koh Tao, Koh Lanta, or Railay. Thailand’s transport system is both convenient and flexible, making travel across the country smooth and easy.

How to get around Thailand? In big cities, I highly recommend trying a tuk-tuk, the most iconic and fun way to get around locally. In quieter destinations such as Chiang Mai or Koh Tao, renting a scooter or bicycle is the best way to move freely, stop wherever you wish, and discover hidden corners off the beaten path that most tours overlook.

3. What to wear in Thailand?

During my Thailand 3-week trip from November to December, the weather was fresh and pleasant. Days were sunny and ideal for sightseeing or lounging on the beach, but evenings, especially in the north, around Chiang Mai and Chiang Rai, could get quite cool. How to dress in Thailand? I recommend versatile clothing: T-shirts and light shirts for the day, and a light sweater or jacket for the evening. Long pants, maxi skirts, or flat shoes are practical for walking comfortably throughout a long Thailand 3-week itinerary. If you’re visiting islands such as Koh Tao, Koh Lanta, or Railay, don’t forget your swimsuit and a light sarong to fully enjoy the sun and the beach.

It’s also important to respect Thai cultural dress codes. When visiting temples or sacred sites, dress modestly, cover your shoulders and knees, and avoid backless tops or short shorts. Slip-on shoes are useful, as you’ll often need to remove them before entering temples. Dressing appropriately not only shows respect for local traditions but also enhances your cultural experience.

After my Thailand 3-week trip, I carry with me memories of authentic landscapes, sincere smiles, and a unique sense of serenity found nowhere else. This Thailand trip allowed me to slow down, savor every moment, and better understand the richness of this fascinating country. If you dream of a Thailand 3-week itinerary that blends culture, nature, and relaxation, I highly recommend AUTOUR ASIA, a best travel agent for Thailand, that made my journey seamless. Their expertise and attentive service truly make a difference, offering Thailand tours designed to suit your preferences, ensuring an experience as authentic as it is unforgettable.