the Similan Islands in the western Andaman Sea are considered the best dive destination in Thailand. The archipelago consist of 9 islands covered in tropical jungle with white sandy beaches. The views under the water surface are even more impressive. There are 2 different kind of dive spots around the Similan Islands. East facing dive sites consists of gently sloping coral reefs while west facing dive sites feature massive granite boulders, covered with hard and soft corals.