If you really want to get away from it all, head for the Similan Islands, a chain of nine small islands about 50 miles from Phuket in Thailand. They’re the home of incredible landscapes, spectacular diving and not a whole lot of other people. The Similans are numbered one through nine, going from north to south, and they’re a national park in the Andaman Sea. You can swim in the turquoise waters of all of them, but you can only step foot on the white sandy beaches of Number Four, which has simple bamboo bungalows, and Number Eight, the largest…