Susquehanna State Park features 15 miles of hiking trails near Harve De Grace, MD.
Susquehanna State Park is located three miles northwest of Havre de Grace off Route 155 in Harford County. The park is approximately 35 miles north of Baltimore. Take I-95 north or south to Route 155, exit 89. Proceed west on Route 155 to Route 161. Turn right on Route 161 and then right on Rock Run Road. Follow Rock Run Road to the park.
http://www.tripleblaze.com/trail.php?c=3&i=418