Our family motto is try most things once. So we sign up for lots of different activities and events and some of them we love. Below are some that we have tried locally and recommend.
We love this small and sufficient museum, it has lots to do from toddlers up to adults. The toddlers come first with the music room filled with things to interact with for kids (and adults) of all ages. Its other
Imagine that Museum, Florham park. Not really a historical museum but a hands on activity center. It is specializes in pre-school age and young school children. Kids love playing here.
We've also heard about the Princeton Art museum family Saturdays but distance has prevented us from experiencing this program. Let me know if you've tried this museum.
The Children's Museum in Bridgewater.