In search of the "world's most beautiful beach" - a first-class sleeper trip on a wooden boat to a small island in Thailand - tourists flocking to the tiny island - are there any other paradisiacal beaches?

"Of the Trang islands, Koh Kradan is perhaps the most beautiful and almost unspoiled. Though it's just a few hours south of Phuket and even closer to Koh Phi Phi, Koh Kradan is a world away. Its natural beauty is untouched, yet it's far from the crowds.