Look good for my school camp in less than 2 weeks?

Okay, so in just 1 week and 4 days, I'm going on camp with about half of my grade. We're going to one of the islands off Brisbane, so we'll be by the beach a lot.
I'm 15, kinda tall and weigh about 67kg. I'm not all that sour about how I look, but was wondering if anyone has any quick fixes to trim some of the fat from my thighs, ass and stomach (bottom bit and just under my boobs) so I can look good in my bikini. Most of the girls that are going all all skinny and thin and I will no doubt look terrible in comparison (I have accepted that and as I said I'm not sour about how I look, I would just like to trim down a little).
Also if any of you guys have any good hairstyles that would suit me (easy to do, cuz remember I'll be on camp). I have thick, slightly wavy, brown hair that goes to the bottom of my shoulder blades.
Thanks in advance guys xxxxxxxx