L.T.
If you plan on having a lot of little kids, then a place like "Pump it up" or something like it is great. My daughter had her 7th b/d there and have also been to many other's like it.
It holds alot of kids, and they have a lot of staff to help manage them too.
I love it when you get a place that entertains them, feeds them, and does the writing for the b/d gifts.
Enjoy! I'm sure what ever you do, it will be a great memory for you all.