Try Camber to Rye to Lydd - a lot of it is on cycle lanes. Definitely head for Dungeness, it's worth the detour. Up along the coast to Folkestone is OK, some of it cycle lane. You might find some back road routes, check Sustrans. Sorry, I don't know north of Deal. Inland there are beautiful empty lanes made for cycle touring.
Try Camber to Rye to Lydd - a lot of it is on cycle lanes. Definitely head for Dungeness, it's worth the detour. Up along the coast to Folkestone is OK, some of it cycle lane. You might find some back road routes, check Sustrans. Sorry, I don't know north of Deal. Inland there are beautiful empty lanes made for cycle touring.