Free things to do in Loudoun & Prince William, Washington, D.C.

Algonkian Regional Park

📍 Sterling · Loudoun & Prince William

NOVA Parks regional park along the Potomac in Sterling with hiking trails, picnic areas, playgrounds, and paid amenities such as golf and seasonal waterpark.

💵 Park open daily sunrise to sunset for general outdoor use. Golf, cottage rentals, picnic shelters, Volcano Island Waterpark, and event facilities charge separately.

🕑 Hours vary by season; see the official page

✓ Checked on the official page Nov 3, 2026