Susquehanna State ParkSusquehanna State Park is a large, bike-friendly park with several trails. The Lower Susquehanna Greenways Trail and the Mason-Dixon trail both pass through the park. Susquehanna State Park's trails are maintained by the Trailspinners and MORE.
Gunpowder Falls State Park Gunpowder Falls State Park is an 18,000 acre state park with over 120 miles of trails. Other activities include swimming at the beach, fishing and canoeing. Gunpowder Falls State Park's trails are maintained by GUMBO and MORE.
Ma & Pa Trail The MA and Pa Heritage Trail is a 6.25-mile trail that runs throughout Harford County. It's divided into three parts: The Bel-Air Trail (2.5 miles), the Fallston Link (2 miles) and the Forest Hill Trail (1.75 miles). It is built on top of the old Ma and Pa Railroad, which means it's an easy ride. Currently, there are plans to expand and connect the trail through the city of Bel Air.