The Heron Trail
Meet Orpington Station, Station Approach side.
From Orpington country lanes as much as possible to Gravesend, then a few miles of traffic free track before joining the Heron Trail through Cliffe, Cooling, Hoo, Upnor, before heading back to Gravesend. Then back to Orpington. Around 60 miles, quite a few hills, relaxed pace. Bring lights just in case.