Birthday Party Please Help [[Easy 10 Points;)]?

Hey. I'm throwing a birthday party for my 12th birthday party containing 11, 12, and 15 year olds. For activities, I already have relays, nail polish game, movies, freeze dance, limbo, hula hoop, prankcalling, truth or dare, skittles game, jacuzzi, scavenger hunt, make up with eyes closed. Do you have any idea what I should do to make both the 15 and 11 year olds happy at the same time? I need more activities and ideas something creative and original. Email and comment ideas as soon as possible: foreverandalways3180@yahoo.com thanks.