Beach Parties and Crab Races

Headed for the island tomorrow, and I just wanted to know- can anyone tell me where and when to find a good beach party or two? (20s-30s crowd)

And where and when can the wife and I find a crab race?

Any help, as always, appreciated. <img src="http://www.traveltalkonline.com/forums/images/graemlins/Joy.gif" alt="" />

Sundown at Buccaneer Beach Bar at Kim Sha Beach ad crab races on exactly a beach party 20-30's but a diverse crowd on all ages 3 - 90