Ko
Samui,
Thailand
's third largest island, and its neighbour Ko Pha-ngan
a celebrated island that hosts the biggest beach full moon party.
North of Ko Pha-ngan is Ko Tao, renowned for its
excellent coral reefs. To top it all is the dazzling
250-square-kilometer Ang Thong Marine National Park, where a
stunning archipelago awaits to greet visitors with their charming
palm-fringed beaches, crystal clear water and colorful coral
reefs. The best time to enjoy one of these islands to the fullest
is from April November.Source
Tourism
Authority of Thailand