JUST LOOKING FOR SOME COOL, INVENTIVE ANSWERS FOR SWEET 16?

Hi! My sweet 16 is this spring, and I need party ideas! It's for a girl, and I have a small budget: no more than $100. I can't get a clubhouse room or a dj, but i do have a large backyard. I want about ten or fifteen of my girl and guy friends to be there. I don't want it to be some boring hang out thing, i want something good...with activities and stuff. IDEAS?! PLEASE!!