OK...here goes...
Be very careful with drugs - it's not Ibiza or London, if you get caught you're b*ggered and your fate depends on the mood of the police.
You probably wouldn't get banged up in the Bangkok Hilton but you might get a fine of 1,000s (they could march you to a cash point and get you to empty your account for example)...just a warning.
Therefore - NEVER score on Haad Rin beach.
KPG is a beautiful island actually - the jungle/rugged coastline/hilly landscape mean that roads can't connect the resorts which means limited electricity etc...and a much more secluded feel.
People will always give you different advice on where to stay but my personal fave is the Sanctuary on Haad Thien (there are loads of surrounding resorts so if you want somewhere cheaper just stay nearby and use their facilities). I had the most amazing time whilst staying there...it's a boat ride around the bay from the main Haad Rin action (but beware of choppy corner - eeek) and is set in a beautiful health resort with hammocks, lanterns etc - ask any of the long boats when you arrive and they'll do you a cheap deal on getting there - it's p*ss easy. The food is lovely and you can do yoga, have a massage/spa, or detox in the 'wellness centre' (colonic stuff :-/)...amongst loads of other stuff.
The people there are always really special but expect to be wierded out by loads of really way out hippies!
It's a really good way to escape the norm because back packers can be really vile and at the end of the day, it's just like being at home.
TBH if I may say so - I think the full moony thing is worth a look but it's a bit cr*p really. The music can be really sh*te...expect road drill techno which is synonymous with the island (and actually quite good over there) and loads of naff stages playing Eminem etc -

:x .
Robder's suggested route - go to Guy's Bar (an amazing club in the trees behind the Sanctuary resort on Haad Thien) - they do mushroom shakes over the bar and generally it's safer to score there...stay there till 3am ish - head over to Haad Rin for the sunrise because all the lightweight tw*ts will have passed out in vomit/gone home by then...and finally head over to the Back Yard club.
Most people will know where Back Yard is...this place is amazing and is easily the DC-10 of Asia (yes it really is that good). Back Yard runs all day so don't burn yourself out too quickly - that's what most people do!
The main full moon event isn't much cop so follow the above advice and you'll experience the best of everything!
...oh and ta for the distraction - was quite a nice way to (not) start work.
