Nope! They're all of the HUMOROUS type...
Actually, there's some good, lengthy trails at Cedarville State Park (off Route 5), and a few at Calvert Cliffs State Park and Flag Ponds Park (both off of Route 2; not particularly "serious," but scenic!) If you go up just north of Baltimore, there's the Gunpowder State Park (near White Marsh, with a nice hike along the Gunpowder River and surrounding rocky hills) and Rock State Park (steep, rocky trails with really spectacular views!) Across the Bay Bridge, there's Tuckahoe State Park (small, with a lake) and Blackwater Wildlife Refuge (flat, hike/bike trail with EXCELLENT resident bald eagle viewing opps!)
PM me if you want more info...