American Museum of Natural History
Start your trip on the thing every kid this age already wants: dinosaurs, the blue whale, and the space hall. The newer Gilder Center adds a live butterfly vivarium and an insectarium, and — for the first time — lets you walk the whole 10-building campus without hitting a dead end, which matters a lot when you're steering tired kids. Strollers are welcome throughout (except theaters, which have dedicated stroller parking).
American Museum of Natural History
Photo: Julian Baidak, Raptor Knight III