Sam Sachs
Google
This is a small and relatively obscure national historic Park but is well worth a visit if you're in the area. They have a series of trails around the surrounding hill. Nothing too challenging, but enough trails to get a sense of the surrounding beauty. The visitor center is relatively small but does a good job of explaining the history of the property and the forest conservation process. Tours of the mansion cost money, but wandering the property is free. Parking is across the street at the nearby farm that is unassociated with the national park system.