Why not join the weekly Sunday walk at Great Falls? The trail is mostly through wooded areas and great for woodpeckers. Plus there are the river overlooks. Sponsored by the park.
Fee is $10 per car; $5 for persons on foot, bicycle, or being dropped off; Or use a National Park Pass
Getting there: From I-495, take exit 44 for route 193 west; continue 4 miles. Turn right on Old Dominion Drive. 9200 Old Dominion Dr., McLean, VA 22102. Meet in front of snack/concession stand at the Park Visitor Center.