Koh Samui is one of Thailand’s most popular destinations, and it’s clear why. When it comes to the best beaches, Koh Samui is abundant with options. This tropical paradise is Thailand’s second-largest island, home to over forty beautiful beaches.       Koh Samui (or Samui Island) is just off the east coast of the Kra Isthmus. Known for its brilliant beaches, mountain landscapes, and coconut groves, this tropical paradise has so much to offer.