This group of islands in Southern Thailand, not far from the popular beach resorts of Koh Samui, offers a different kind of tropical experience. The islands, all but one of which are uninhabited, are made of limestone and covered with lush tropical foliage and stunning rock formations. Many have narrow beaches that are only accessible by boat. Thailand's Southern islands have long been popular with adventure-seekers and budget backpackers, so there is a steady stream of tourists seeking day-trip excursions to the beaches of these islands. Fortunately, the entire archipelago is part of a national park, so entrance is controlled, with only a handful of kayak tour operators offering access to these unique islands.