Smithfield Cruise is a 40 mile loop trail located near Smithfield, Virginia and is rated as moderate. The trail is primarily used for road biking and mountain biking and is accessible year-round.
It has been a couple years but I remember that I liked this ride for the back roads.
I think I should not try to ride this far again. It is not all that hilly but just a long ride. Also, some of the roads are narrow so traffic is an issue.