We'll probably have about 75 people, including a bunch of kids, for a luncheon party. A pretty setting would be nice (it will be in the spring), and we'll need room for dancing and games for the kids. But we're looking for something that's not over the top, either in decor, elaborate cuisine, or expense. Something just simple, modest, and attractive. Our budget is pretty tight. Any suggestions? We're willing to look anywhere in Manhattan. Thanks for whatever suggestions you can provide.