Thinking about heading to tonsai for a few months. What do I need to know?

that it will be a lot more fun if you take me with you. that is all.

Stay away from the pharmacies...evil

Don't skip over Bangkok, its a lot of fun. Try to get a hotel close to the sky train, it's cheaper to get around. When you head down south either take a train or fly, buses suck! Don't book a place ahead of time, just get there in the morning and walk around to different places until you find a good place to stay (sometimes they will throw you a deal for staying for an extended period). Look around Tonsai Bay, not Railay. Here is a like to my girlfriend's blog. It has a lot of great info.

bradleysadventures.wordpress.com/2012/02/21/thailand/

All the climbing is unreal, you can't go wrong. Have fun!

thanks dudes solid advice. but whats with the pharmacies

As for the pharmacies, you will never know unless you find out for yourself. I imagine your experience will depend on your needs and your character. Have fun. Don't book anything in advance is the best advice.