Rosaryville State Park is a great mountain biking destination with a lot of tight, twisty singletrack with some short steep hills. There are beautiful overlooks, awesome forest plant life as well as wildlife, and large open fields. There is nothing really technical on the trail that an intermediate rider will not handle with ease. The trail is also shared with equestrians and riders should yield to them. The Mount Airy Mansion is also found in the park and was the home of the Calvert family from 1730-1788.