C.M.
Sno-ball fight!
I have not met a teen yet who has not had the best time. Plus they get to make their own shaved ice. www.CandiSno.com Teen girls love to make sno-girls too, they really work on decorating them up. You would think they are too old, but they seem to have more fun than the little kids because they have better control of their hands.
If you are wanting to go for an outing, what about going to see a movie? Or something inexpensive is just go to the mall and get a smoothie, ice cream or cookie, girls love walking around the mall to goo-goo at guys or window shop.
Some girls like arcade games, although they wont admit it. lol But once they get to putt-putt they would have a blast. A lot of times you think teens are too old for things, but when you start doing something they have a blast!
Good luck and have fun!