If you are going Boston to Niagra Falls and then back across NY to NJ there's lots of possibilites jsut don't know your interests. I'll just throw some idea out there.
At least two museums in Cooperstown. (that's NY state) Bear mountain state park (NY state), Olana & old Sturbridge Village (Hudson river valley),
High Point NJ is a scenic area.
Edison's Labs and House (Edison National Historic Site) in NJ
I take a closer look in google, you always have to be open for something new! I forced my wife to visit the USS Midway in San Diego, after 15 minutes she was so impressed i couldn't force her to leave the ship...3h later!
