Starting from the historic streets of Old Town Alexandria, the Mount Vernon Trail unfolds before you like a ribbon along the Potomac River’s edge. This self-guided bike tour offers roughly 10 miles of predominantly flat terrain that invites riders of moderate fitness to pedal at their own pace, taking in sharp views of the river daring you onward while gentle breezes temper the effort. The trail rolls gently with a few hills, weaving through forested patches that reveal glimpses of waterfowl and the occasional sun-dappled clearing where the city’s urban hum fades.