The archipelago opposite the Surat Thani province in the Gulf of Thailand is home to three islands that will vie for your attention. Firstly, Koh Samui, whose long beaches shaded by coconut trees play host to elegant resorts; Koh Pha-Ngan, much more "wild" and a favourite with young party animals; and Koh Tao, the smallest, renowned for its deep-diving spots. Although Koh Samui opened up to tourism in the 1980s, it has kept most of the charms that have accounted for its success. You will find the most lovely beaches on its eastern shores, at Chaweng and Lamaï. As for Koh Pha-Ngan, it offers an atmosphere reminiscent of the Koh Samui of the 1980s. Its laidback environment has been largely appreciated by young people worldwide, especially during the "full moon" parties: a famous celebration held each month on Haad Rin Beach during the full moon (a 20 minute speedboat ride from Koh Samui). It is THE attraction for all party animals and lovers of electronic music, who appreciate both the quality of the music and the magnificient setting. Off the coast, do not miss out on two incredible sites: Ang Thong islands, a superb archipelago listed as a National Maritime Park, and Koh Tao, a garden of tranquility and a hit with diving enthusiasts. Finally, still in the Siam Gulf but a 5 or 6 hour drive from Bangkok (on the Cambodian border), Koh Chang is prized for its wild, untamed jungle landscape.