Thailand has a wide variety of islands to visit, each with its unique beauty, culture, and atmosphere. Some of the best islands to visit in Thailand include:

- Koh Phi Phi: This island group is known for its stunning beaches, crystal-clear waters, and vibrant nightlife. Maya Bay is the most famous beach in this island, it’s a must-visit spot for many travelers.
- Koh Samui: This island is known for its beautiful beaches, crystal-clear waters, and great nightlife. Chaweng Beach is one of the most popular beaches on the island and it’s known for its lively atmosphere.
- Koh Phangan: This island is known for its beautiful beaches, crystal-clear waters, and the famous Full Moon Party. Haad Rin Beach is the most famous beach on the island and it’s the location of the Full Moon Party.
- Koh Tao: This island is known for its beautiful beaches, crystal-clear waters, and great diving and snorkeling. Sairee Beach and Shark Bay are two of the most popular spots on the island.
- Koh Samet: This island is known for its beautiful beaches, crystal-clear waters, and laid-back atmosphere. The best beaches on the island include Ao Prao, Saikaew and Ao Phai.
- Koh Lipe: This island is known as the Maldives of Thailand, Koh Lipe is a beautiful island with crystal-clear waters and white sandy beaches.
- Koh Chang: This island located in the east coast of Thailand, it offers beautiful beaches, crystal-clear waters, and a laid-back atmosphere.
- Koh Kood: This island is known for its beautiful beaches, crystal-clear waters, and lush tropical forests. It’s less developed and less crowded than other popular islands in Thailand, making it a great spot for a peaceful beach vacation.
- Koh Krabi: This island group is known for its limestone cliffs, crystal-clear waters, and great diving and snorkeling. Koh Poda, Koh Gai, and Koh Mor are some of the most famous islands in this group.
- Koh Lanta: This island is known for its beautiful beaches, crystal-clear waters, and laid-back atmosphere. It’s a great spot for a relaxing beach vacation and is popular with families and solo travelers.
- Koh Tarutao: This island located in the south of Thailand, it offers beautiful beaches, crystal-clear waters, and a great diving and snorkeling spot.
- Koh Rok: This island located in the south of Thailand, it offers beautiful beaches, crystal-clear waters, and a great diving and snorkeling spot.
- Koh Surin: This island located in the Andaman sea, it offers beautiful beaches, crystal-clear waters, and a great diving and snorkeling spot.
- Koh Adang: This island located in the Andaman sea, it offers beautiful beaches, crystal-clear waters, and a great diving and snorkeling spot.
- Koh Similan: This island located in the Andaman sea, it offers beautiful beaches, crystal-clear waters, and a great diving and snorkeling spot.
These are some of the most popular and beautiful islands to visit in Thailand, but there are many more to explore, each with its own unique charm and character.