Koh Lanta is one of the most relaxed islands in southern Thailand, known for its long sandy beaches, laid-back atmosphere, and access to some of the best diving sites in the Andaman Sea. Among the best things to do in Koh Lanta are visiting Mu Koh Lanta National Park, exploring the island’s beaches, and joining diving trips in the Andaman Sea. Koh Lanta is also a great base for exploring nearby islands such as Koh Rok and Koh Haa.

Just an hour away from Koh Phi Phi by ferry, Koh Lanta was meant to be my gateway to some of Thailand’s best diving. I planned to dive at Hin Daeng and Hin Muang. These two world-famous dive sites are known for their dramatic underwater pinnacles, vibrant coral, and the chance to see manta rays. However, due to rough seas and bad weather, the dive center—which told me they rarely cancel—had to call off the trip. It was an infrequent occurrence during the dry season, and unfortunately, I was out of luck. Instead, I decided to make the most of my time by exploring Mu Koh Lanta National Park.

Mu Koh Lanta National Park: A Jungle and Coastal Paradise

Located at the southern tip of the island, Mu Koh Lanta National Park is a stunning blend of tropical jungle, rugged coastline, and pristine beaches. The park’s highlight is the iconic lighthouse, perched on a rocky cliff overlooking the Andaman Sea—perfect for panoramic views. I hiked through the lush rainforest trails, where I encountered curious monkeys and heard the sounds of tropical birds. The secluded beaches within the park, with their golden sand and turquoise waters, made for an ideal spot to relax. The double beach configuration, with a small hill in the middle, reminded me Koka Beach in Indonesia and Porto Timoni in Corfu. Maybe I will write an article one day about all the double beaches I have visited in the world!

Best Beaches in Koh Lanta

Koh Lanta is known for its long, uncrowded beaches stretching along the island’s western coast. Compared to other destinations in southern Thailand, the beaches here feel more relaxed and less developed, making the island a great place to unwind. Whether you’re looking for sunset beach bars, quiet bays surrounded by jungle, or peaceful stretches of sand with crystal-clear water, Koh Lanta offers several beautiful options.

Long Beach (Phra Ae Beach)

Long Beach, also known as Phra Ae Beach, is one of the most popular beaches in Koh Lanta. As its name suggests, the beach stretches for several kilometers, offering soft golden sand and clear water ideal for swimming. The area is also home to many restaurants, beach bars, and small resorts, making it a lively but still relaxed place to stay. Long Beach is particularly famous for its spectacular sunsets, when the sky turns orange and pink over the Andaman Sea.

Kantiang Bay

Located further south on the island, Kantiang Bay is one of the most scenic beaches in Koh Lanta. The bay is surrounded by lush green hills and offers calm turquoise water and soft sand, creating a peaceful tropical atmosphere. Compared to Long Beach, Kantiang Bay feels quieter and more secluded. A few boutique resorts and beachfront restaurants are located nearby, making it a great spot for travelers looking for a more tranquil beach experience.

Bamboo Bay

At the southern end of Koh Lanta, near Mu Koh Lanta National Park, Bamboo Bay is one of the island’s most secluded and pristine beaches. Surrounded by jungle-covered hills, the beach features crystal-clear water and a wide stretch of sand with very few visitors. Its remote location makes Bamboo Bay feel almost untouched, offering a perfect escape for those seeking peace and natural beauty. The beach is also a great place to relax after visiting the nearby lighthouse and trails in the national park.

Snorkeling and Diving in Koh Lanta

Koh Lanta is known to offer fantastic underwater experiences. The nearby Koh Rok islands are a top snorkeling destination, with pristine reefs and an abundance of marine life. The Four Islands Tour takes you to snorkeling spots and even includes a visit to the Emerald Cave, where you swim through a dark tunnel to reach a hidden lagoon.

Hin Daeng and Hin Muang: Thailand’s Best Deep-Dive Sites

Located in the open sea south of Koh Lanta, Hin Daeng and Hin Muang are two of Thailand’s most spectacular dive sites. Hin Daeng, also known as Red Rock, is famous for its deep drop-offs. There, you can see red soft corals, schools of trevallies, barracudas, and occasionally even manta rays or whale sharks. Just a short distance away, Hin Muang, or Purple Rock, is Thailand’s deepest reef, renowned for its stunning purple corals and large pelagic fish. Due to the strong currents and depths exceeding 60 meters, these sites are best suited for advanced divers seeking thrilling underwater encounters. I was disappointed that I couldn’t dive these two sites, but I will certainly return!

I was suggested to dive at Koh Haa instead. Dive centers promote it as a spectacular dive site with caves, caverns, and diverse marine life. However, some friends mentioned that while the site is nice, I might be disappointed compared to the best dive sites in Indonesia, where I live.

Koh Lanta Old Town: A Step Back in Time

Unlike the resort areas, Koh Lanta Old Town offers a glimpse into the island’s rich history. This charming fishing village, with its wooden stilt houses and colorful shops, has a laid-back and authentic feel. Originally a trading port for Thai, Chinese, and Muslim communities, the town still reflects this cultural mix. I wandered through the small streets, browsing handmade crafts and enjoying a meal at a waterfront restaurant with stunning sea views. The slower pace and welcoming atmosphere made it a refreshing contrast to the island’s beach life.

Conclusion: Discover the Best of Koh Lanta

With its long sandy beaches, relaxed island atmosphere, and access to some of the best diving sites in the Andaman Sea, Koh Lanta is one of the most enjoyable destinations in southern Thailand. Whether you’re exploring Mu Koh Lanta National Park, relaxing on beautiful beaches like Long Beach or Kantiang Bay, or joining snorkeling and diving trips to nearby islands, Koh Lanta offers a perfect balance between adventure and tranquility.

The island is also ideally located for exploring other destinations in the region, including Koh Phi Phi and the spectacular limestone cliffs of Railay Beach.

If you’re planning a trip through the region, you can read my complete Krabi Islands Travel Guide: Koh Phi Phi, Koh Lanta & Railay Beach, where I explain how to combine these destinations and explore the best islands of the Andaman Sea.