The park rests in a scenic stream valley, extending for 12 miles along Seneca Creek. Many marked trails wind through a variety of habitats typical of central Maryland. Visitors can hike a self-guided interpretive trail, which explores the historic Clopper Estate.
The 90-acre Clopper Lake provides fishing and boating opportunities, and creates vistas for all to enjoy.
Seneca Creek State Park offers an accessible Visitor Center, six large picnic shelters, and many family picnic sites. Three picnic sites have been designed specifically for wheelchair access. Seven of 11 restrooms in the park are accessible via paved walkways. The Boat Center has a paved lakefront walkway for fishing access, as well as a wheelchair-accessible 32-foot pontoon tour boat. There are also pedal boats available for rent and an extensive 18-hole disc golf course.
The 3.7-mile Lake Shore Trail encircles Clopper Lake, crosses meadows where wildflowers flourish in the spring and summer, and traverses the dam. This trail also allows mountain bikes in some areas.