C & O Canal Towpath – 184 miles of recreational trail for walking, running, and biking.

Catoctin Creek Nature Center – Fishing, hiking trails, playgrounds, pet-friendly and picnic areas.

Catoctin Mountain National Park – Trails, cross country skiing, fishing, horse trails, orienteering, rock climbing.

Cunningham Falls State Park – Hiking trails, camping, swimming, canoeing, paddle boarding.

Gambrill State Park – Hiking trails, camping, and fishing.

Gathland State Park – The Appalachian Trail passes through this park.

Hippy Viking – Guided hikes in and around the Frederick area.

Frederick County Hiking Trails – List of county park trail distances.

Frederick History Bicycle Loop – 10 mile bike tour of Frederick area.

Fountain Rock Park & Nature Center – Fishing, hiking trails and play equipment.

Goat for the Soul – Goat Yoga.

Maryland Appalachian Trail – 40 miles of the AT pass through Maryland, mostly along the South Mountain ridgeline.

River & Trail Outfitters – Kayaking/canoeing, rafting, tubing and camping.

River’s Edge Trails – Over four miles of mountain biking trails in Brunswick.

TreeTrekkers – Outdoor aerial adventure and zipline park.