New Jersey

I have been selected to work on a multi-state committee for a teacher test that many states use. The committee work will take place in Princeton, New Jersey over two days in February. I would really like to extend my time there and enjoy some culture and sights of the area but with the weather being so cold in February I'm not sure what I would want to do and could do. Davin won't go with me because he hates big cities. I don't mind traveling and experiencing things alone but I don't know what I want to do. New York City, Philedelpia and Lancaster, PA are only 2 hours away.