Koh Samui is a great place to be a savage for 3 weeks.
You can have yourself polluted on bacardi before lunch, then go cruise a jetski or a scooter untill you find a place to eat, continue drinking, go bunjee jumping, eat again, sleep untill midnight, check out a mauy thai fight at Chaweng stadium, hit the vodka and redbull at the green mango (the viking bar is CF-Friendly), dodge ladyboys outside, ride around in a tuktuk for awhile, drink with the tuk tuk driver, ride around some more, figure out where the after hours bar is (forget the name, there's a pool in the back - don't drown), then pass out on the front porch of your bungalow because you lost your key in the jungle somewhere. The next morning, if you find that you no longer have a shirt, you can just walk out the the street and buy a new one for 150 bhat - pennies - and do it all again.
The whole thing is criminal, it really is. But you havn't lived untill you've seen two drunk newfies at 7:00am on the side of the road kicking their rented streetbikes back into shape after thinking that going for a ride after the Full Moon Party was a good idea.
I'm serious: be carefull in Thailand.