This is a good introduction to gravel riding route that begins and ends at the historic Prallsville Mill.
Be sure to spend some time reading about the history of the mill and visiting the historic buildings.
The route starts along the Delaware River before the first of the gravel roads.
The turn is across from Bull's Island Recreation Area. The pedestrian bridge in the park crosses the Delaware River and the towpath on either side.
The quiet back roads take you to the very last Covered Bridge in New Jersey.
Once in Sergeantsville the roads get a bit busier, but offer a very wide shoulder most of the way.
Upon return, take some time to pedal on the Delaware-Raritan Canal Towpath to enjoy and extend the route.