This is a stunning walk I did the other day that totally exceded my expectations. Since I live in Surrey and dont own a car, I dont have mountains accessible but the coast is really nice. Took a morning train and got to Sandwich by 12. From there you walk through green areas and a (surprisingly nice) golfcourse until you reach the sea. Then walk south to Deal (lovely, full of flowers and birds now in june). Up St Margaret Cliffs Then France according to my phone, The stunning cliffs of Dover, end in Dover and train back around 8pm. Made it home by 11pm Really recomend it.