Steve: Freda, probably the most popular place for REALLY LONG ADVENTURES is the Washington and Old DominionRailroad trail.
It is around 45 some miles long, 9 feet wide and even has parts where you can ride horses safely.
You can check it out at:Old Dominion Park as well as Trail link (you can find other local places for adventure on this site)
Friends of ours will routinely ride from Reston into Vienna VA, with ones in really good condition riding all the way in to the Potomac River across from DC.
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