J.S.
The Monterey Sports Club is fairly reasonable too. You can rent the pool for up to 30 people and a nearby yoga room for food. It's on 96th St. I can't decide if the parents would think the swimming part was fun or annoying though?
I looked up and got $660 for 10 kids at the Central Park Zoo for a party with pizza. The lower amount must just be for the entrance fee? If so, I think Uno's is better since you will have food and a party area for everyone at the party?
I also heard the Marionette Theater in Central Park does parties. The puppet shows are good for 4 year olds - I am not sure what the room rental/food costs would be.