Sorry - you probably don't want loads of tips but I'll do it anyway -
I'd get off a stop earlier and head up the bridleway from Westhumble to Ranmore. It's quite a crank to the top, but lots nicer than the road. Can also grab a flapjack from the lovely pilgrim cycles at the station (opens at 10am).
these trains from/to london, so meet dorking station 10am?
also paging @spotter @7Üp @Dogs