Capital Crescent - Georgetown Branch - Rock Crek Loop

This is a  perfect 20-mile loop vith very little traffic and not that much elevation change.

There is about a mile or two of loose gravel at the northern end (Georgetown Branch), but the rest is paved trail or relatively quiet roadways.

Not recommended during rush hour, though, since Beach Drive in Rock Creek Park can get busy.  There are trail alternatives, but the surface quality is not great (potholes, etc).