Hi I'm hoping to get some advice in planning my 3 week trip to Thailand - I'm leaving on Tuesday!

I want to do some outdoor rock climbing, maybe a few dives, white water rafting and any essential sites that I must squeeze in. It's early rainy season so I'm taking a risk and so far my plans are:

Fly South as soon as I touch down in Bangkok and get to Karabi for climbing, then a few dives - maybe a 2 day liveaboard to the Similan Islands. Um after that well I need to look at my lonely planet.

So any suggestions? good climbing and dive operators? - also any nice social places I can go to find like minded solo travelers to hook up with? - Any 'Lone traveller Marts' - LOL

I'd appreciate any advice- thanks,

Mike