Birch Grove Park Loop Trail is a 1.5 mile loop trail located near Northfield, New Jersey. The trail is good for all skill levels and primarily used for hiking, walking, and camping.
This is a great trail, has hills, fallen trees to climb over or under, ditches to jump across and some fitness equipment to use along the way. I have put together a group and we bring some of our own weights and exercise ball to use before we hike. It's awesome!