We had a joint birthday party for our 4 and 2 year old sons (birthdays 1 month apart) at The Playroom in East Cobb. It's a gymnastics/cheer academy that also does parties, drop in play, etc. For 200.00 they provide 2 instructors to lead activities for 1 hr., decorations, plates, etc. (coordinated to your theme)for a 1/2 hr. cake/present opening. They have trampolines, a foam pit and very imaginative instructors. My 12 year old nephew had as good a time as my 2 year old son did.
What I liked about it was that it was so much more organized and lots less chaotic than some of the "bouncy places" we've been to for other parties. The kids actually were able to interact with each other instead of running around with that glazed over look in their eyes. Anyway, I HIGHLY recommend them.
Hope this helps