I came across the Similan Islands on this great blog Mr and Mrs Globe Trot, which is the diary of American couple Julia and Yuriy, who got married then took off overseas for six months visiting all sorts of off-the-beaten-track places like Laos and Ukraine as well as some popular tourist spots like London and Paris. They have long-since returned, but still have a backlog of posts which I follow religiously because it's the kind of trip we want to do sometime in the next couple of years, except we want to see more of Europe, the UK and America rather than the Asian countries they've been to.
But, I think I can make an exception for Thailand, especially if it includes a trip to the Similan Islands. Check out Julia's post here - that would be the life wouldn't it?