Similan Islands Tours - Similan Islands National Park is a group of 9 islands off the west coast of the city Phang Nga in the Andaman sea. The name ‘Similan’ comes from the Malay word ‘sembilan’, which means nine. This National Park is an invaluable site of national heritage. The Koh Similan National Park is free from crass commercialism, is unspoiled and one of the best snorkeling and dive sites in the world.