Koh Samui is an island in the Gulf of Thailand on the east coast of Thailand and is part of Surat Thani province. Surat Thani is 35 km away.Koh Samui has become a popular destination for tourists seeking relaxation and adventure.Angthong National Marine Park, one of the most famous places in Koh Samui. Angthong national park best for swim,Relax and Kayaking at the beach. Another famous island of Koh Samui is Koh Tan, Koh Tao and Koh Nang Yuan.Koh Madsum is a small island in the Samui Archipelago aslo know as a Pig island.