Please and thank you.

My friend is throwing a beach themed party, and I don't know what to wear. I'd rather not wear a swim suit. Maybe one underneath, though.
Mega thanks!
Oh, and I'm 13, I like all colors except purple, black and red, and I buy clothes anywhere except H&M, Forever 21, AE, Wetseal, and Hot Topic. I am most definately NOT an emo, LOL! I'm like a boho-prep!
Thanks!
There are gonna be really cute guys there, haha. We go to different schools, and all the guys at her school are so damn hot!