hey...i had my 11th b-day party last year...i had a sleep over with about 12 grlz but during the day(this might sound a little immature)i rented a "Dino Jump" its like a room set up outside that you jump and flip around in...trust me everyone had a great time!!! but if your inviting guyz....they'll love it but there a little rough hope you hav a great b-day~