I just spent a week in Pai which is in northern Thailand. I've seen more Thai hippies than you cold shake a stick at. A very chilled out place.
I'm now on my way to Lao, where I'm starting the Gibbon Experience (Google it) tomorrow, which lasts for three days. You basically live in treehouses and zipcord between them. It's one of the coolest things to do in Southeast Asia so I've heard.
Gotta catch the bus, just letting everyone know I'm not dead.