Last year we cycled from Guildford to Paris as part of our training Mr NN made us cycle regularly from Witley up to the Devils Punch Bowl. Clearing geo-caches as we went often going off in different directions. Often talking about the places to place caches, and laughing at some of the ones that took as days to complete.
If you stick to our route it will take approximately one to two hours on your bike, the route will take you along the old A3 route giving great views of the north portal and easy access on to the punch bowl and beyond