Central Park. With its lovely carousel, a zoo, two ice-skating rinks, and numerous playgrounds and ball fields, Central Park is a children's wonderland.
Bronx Zoo Wildlife Conservation Park. This is one of the great zoos in the world -- and you don't have to be a kid to love it.
New York Hall of Science. This Queens museum in Flushing Meadows-Corona Park has hands-on exhibits that thrill children from pre-school and up. And after the museum the park offers a carousel, zoo, and boat and bike rentals.