This is an excellent place to visit and walk around. I highly recommend that you take the guided tour around the entire site. The guided walking tour we did was approximately 7 miles of walking and hiking around the site- it took us about 4 hours to complete. They have a driving tour option if you'd prefer that instead.
Very kind and helpful rangers. Lots of interesting historical artifacts to see and even a short movie about the winter Washington and his troops spent here. Highly recommended.