It's the sand. Powder white, bordered by tropical blue water on one side and lush greenery on the other, the beaches (particularly along the island's southern shorelines) are what made Phuket one of the hottest playgrounds of Southeast Asia. Patong Beach is the most famous, but it's not exactly a secluded getaway. For that, head south. Nai Harn is a lovely, low-key strand anchored by the posh Phuket Yacht Club, but for a little more privacy, go through the club's grounds to Ao Sane Beach, a small bay where life's choices come down to warm sand or warm water.