Depends on your personality, and what you're looking for. I wouldn't personally recommend Phuket, as it's an overpriced shithole filled with rip offs and scam artists. I would recommend Thailand though, but can't quite say where, as no idea what you're looking for. You want hookers & blow, quiet life, culture, mountains, beach, adventure, what?
If you do goto Phuket, I can recommend this hotel. It's out of the way a bit, but kicks ass:
http://www.accessresort.com/
Your room is connected to the pool. So you come in from the day, all hot & sweaty, then just walk out the back door of your room, hop into the pool, and swim over to the pool bar for a beer. Was great!
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