We have a 6 yr old and 2 yr old, live in North Jersey. Some suggestions from this area of the NE
Lancaster County, PA - large tourism area, Amish. several nice campgrounds
Jersey Shore - all the tourism areas are open. nice campgrounds in the Cape May area and Sea Isle City
Knoebels amusement park with campground in PA
Otter Lake Camping Resort, Pocono area of PA
Scranton, PA - Steamtown National Historic Site, Lackawanna Coal Mine Tour, Trolley Museum (shares the Steamtown parking lot)...trolley runs on Sunday (as of last year) to the Yankees Triple-A minor league baseball team
Ct - Mystic Seaport; Groton CT submarine museum. Checkout Strawberry Park Campground, it is central located to these places as well as Essex Steam Train, Newport, RI, and the CT and RI shoreline.
Good Sam Life Members. Camping with two young children in a 2007 Pilgrim fifth wheel (278BHSS) pulled with a 2002 F350.