ideas for my 13th birthday?

my birthday is late october, and im turning 13. im a girl, but dont even THINK about suggesting a "makeover" party or some other girly monstrosity. im not a girly girl, and i dont like sports. i want to do something relatively cheap. im going to have 7 or 8 people coming, and i dont want to spend it at home or the ymca. im still kind of into kiddish stuff. last year, i had my birthday at lazerzone, a lasertag/arcade place, and it was AWESOME. the year before that, my friends and i went to this place called the rainbow of new england, where there was a room full of trampolines and playground equipment we could play on. ive also gone to the beach for my birthday, but my parents wont let me this year, as its going to be cold. my birthday is 2 days before halloween, but i dont want anything halloween-related. i hav no idea what to do this year... ideas? :)))