Have you been to the Howell Living History Farm in Lambertville?  How about the Marine Mammal Stranding Center in Brigatine?  Or the Frelinghuysen Arboretum?  Some of these destinations might be too much of a drive for northerners, but hey, they're free.  This is another great piece from Kristen Koennemann, the New Jersey expert over at Only in Your State.