The secluded Thai island of Koh Tao offers a wide array of outdoor activities, including some great snorkeling, sea kayaking, diving, several sandy beaches, and quad excursions. Just note that depending on sea currents, local beaches can occasionally be strewn with debris. While this is an issue all over the island, not all Koh Tao hotel beaches are alike. Some are pristine and remote (as in only-accessible-by-boat-remote), while others are smaller, crowded, and disappear at high tide.