I second Nicole's suggestion. The highlight of my "pre-surgery" tourism was spending a few days at Ko Si Chang Island. It's about a 2 hr bus ride south of Bangkok to Sri Racha, then a 45 minute ferry ride to the island. The main (almost only form) of transportation is mopeds. There's a port on one side of the island with a nice hotel, and a really nice beach on the other side with a slightly lesser quality hotel. I was there three nights, had a great time, and the room(s), moped, food etc, came to about $150 US.
Cheers
Kim
