How much money do I need on a Full Moon Night?(2005-10-07)
Don't take more than 3.000 Baht (unless you are a relly big spender) and store your valubles at a safe place in your resort. Each Full Moon the temporay local police made "Jail Tent" (at the party beach) is full of small time gangsters and ladyboys.
Is it possible to find an accommodation without advance booking?(2005-10-07)
Sure it's possible, but around Full Moon (3 days before and after) Haad Rin usually gets relly crowded, and there is not much to choose from. In the High Season you should do an advance booking before.