15th Birthday/Going Away Party

I am having a birthday/going away party sometime this month. I already turned 15 (on December 26th, but I was in Oklahoma for the holidays) I have no clue what I want to do! I did want to go to laser tag, but that is to expensive for only a twenty minute game! So I was hoping somebody had ideas or tips I could use. It is going to be a boy/girl party and that is a first for me. I cant figure anything out that isn`t to girly. I am on a budget, and don`t want anything way to elaborate. I hope someone has ideas! Thanks!