What could be more posh than cruising the Andaman sea in your own private yacht? There are several options to choose from, but for me, the "dream boat" would be the Queen of the Andaman, a new (2007) classically styled sailing Ketch. Four master cabins means you can bring along several of your friends.

If you're in the mood for a more adventurous cruise, then SEAL (South East Asia Liveaboards) is the place you want to visit. They have everything from kayaks to cats to large sailing vessels. The larger boats are fitted out for diving holidays, with fully equipped dive shops and all the other gear you'll need.

Have the boat, but need a place to park it? Then have a look at the Royal Phuket Marina. Their "Aquaminium" claims to be the first condominium designed to house a private yacht berth.