There are many places you could go like:
Bowling, Out to eat, Put-Put golfing, Movies, a water park (if its warm), skating, and lazer tag. I think u should try skating because that would be really fun I did that for my birthday once and it was blast. Everyone likes to skate so that shouldnt be a proablem and if someone doesnt know how then tell them this is there chance to learn. Well I hope this helps