"The 18-mile Mount Vernon Trail is one of the Washington, D.C., metro area’s most popular trails. Just across the Potomac River from D.C. in Virginia, the trail links Theodore Roosevelt Island Park with George Washington’s estate in Mount Vernon.
The trail follows the course of the Potomac, passing through parks, yacht clubs, wetlands, neighborhoods, towns, and wooded acres. The route is mostly paved, but some sections are
boardwalk. In many places, the winding path is narrow, and because it is heavily used (especially on weekends), all recreationists—whether on foot, skates, or bike—must use caution when passing others and when entering the trail from any of its numerous access points."