I haven't been there yet but plan to in the near future but in the shopping center right next to The Little Gym (it used to be home of the RAGG Shop, which has since closed, and Mandees and a bunch of other little stores) there is Bounce U. Its one of those inflatable bouncey places that all kids love. I think they have a website you can check out. It looks like its next door to the laundromat, on the lower level.
Then there is this lazer tag place on Willets Point (sorry I dont know the name of this place), before the entrance of of the Cross Island Pkwy if you are heading east, in the 7-11 shopping center. I hear that was a big hit with my newphew who went there for a 6th b-day party.
Hope this helps. Enjoy.