The Garvies Point Museum in Glen Cove has an interesting mix of geological and historical exhibits that will engage kids who are interested in dinosaurs, rocks or Native Americans.
Fun 4 All indoor playground and party center in Port Jefferson is a great spot to take kids on a rainy or cold day when being cooped up at home just isn't an option.
The South Shore Nature Center in East Islip is the home of a small museum where kids can get a closeup look at some native Long Island wildlife, as well as an extensive complex of walking trails.