Most Asian countries with coastline experience at least part of their wet season during the summer, but Koh Samui is one of the few places we recommend visiting at this time of year because it is typically hot but relatively dry. Beautiful fine sand beaches on the calm, warm Gulf of Siam and a wide array of water sports, including sailing, fishing, snorkeling, and boogie boarding are available, in addition to hikes through the rainforest, delicious Thai cuisine and indulgent spa treatments.