Patapsco Valley State Park
Patapsco Valley State Park extends along 32 miles of the Patapsco River. It includes eight developed recreational areas offering hiking, fishing, camping, canoeing, horseback and mountain bike trails, as well as picnicking. There are “over 200 miles of trails, with 70 of those miles identified as maintained trails. There are hiker only trails and multi-use trails accessible from many areas of Patapsco.” Here is the Park website. Phone 410-461-5005
Gristmill Trail, 2.5 miles runs through woods and along a river. Map Here is another map of the trail .