Make your island-hopping adventure in Thailand easy on this all-day speedboat trip from Koh Samui to islands: Koh Tao and Koh Nang Yuan, located to the north of Samui, are two of the most beautiful islands in the world. Explore the clear turquoise waters and white sandy beaches of the islands, which are both home to coral reefs, giant clams, and colorful tropical fish. Snorkeling is available on each island.