Seneca Creek State Park offers a variety of trails for mountain biking and hiking, playgrounds and picnic areas for family time and scenic views of Clopper Lake. It extends for 14 miles, following Seneca Creek through Montgomery County to the Potomac River. The 90-acre lake offers fishing and boating, as well. Visitors can explore the area's history on a short self-guided tour, and there is a disc-golf course and hunting within the park.