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Far less crowded than Great Falls Park. Walk for miles in the undeveloped forested hills along the Potomac. Not to be confused with the Maryland parks Little Seneca or Seneca Creek.
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Great regional park, hailed as Northern Virginia's backyard and very popular for picnics and barbecues. Common activities include hiking, rock climbing, and whitewater rafting. There can be lines into the park on weekends, especially on holidays like Fathers' Day and Labor Day, so plan ahead. The park has several marked trails, including the very popular Billy Goat Trail.