Discover the brilliant, sunlit reefs of Koh Tan and Koh Mudsum on a guided, half-day snorkeling tour from Koh Samui. Travel by traditional longtail boat to Koh Tan, and float above rays, sponges and iridescent corals as you relax in the shallow waters above the reef. Sink into the pristine sandy beaches of Koh Mudsum before slipping into the ocean for a final snorkel. When complete, you will be transferred back to your hotel.