Full Moon Party is not just a normal party but monthly Haad Rin's dance music festival which is famous worldwide, with everything from drum and bass to full-on psy-trance. Paradise Bungalows, the site of the original Full Moon Party, consistently puts on the biggest show with inspired decor and a combination of superb resident and international guest DJs.
more information look at : Full moon party mooyongtourthai.blogspot.com
I think it's a personal decision, of course you can get drugs(I am sure) but if you don't do drugs, nobody will force you!!! and there are so many people and it's a big place....