Lewis/Trow Mound trail access is free for those on foot. There are also paid campsites near the parking lot with bathroom and shower facilities.
Lewis/Trow Mound is a very well maintained trail system that contains trails primarily used for mountain biking and cross country skiing. Because of this many of trails that are labeled as "difficult" on the trail map are very hilly with steep many ups and downs.
Never a dull moment on this one. Lots of twists and turns through the forest with some hills added in for fun. The trail spits you out on a clearing on top of a hill with options for connections to other trails. Trails at Lewis/Trow Mound are generally pretty quiet with the exception of a few mountain bikers.
The best way to access this trail is to take the Lower Glen Trail from the parking lot and connect with the Swamp Cut Trail. Trails here are very well marked and labeled at intersections, so it should be easy to navigate.