Recommendations for active break within 2 hours of here?

[nunheadmum]

We've potentially got the chance of a 2 night break from the kids later this month. I fancy going somewhere that we could go walking or for a bike ride. Also needs to have nice restaurant for a good meal. Won't get away till around 6pm on the first night so don't want to go too far.

Any good suggestions? Would probably prefer to avoid Sussex as got family there so it won't feel like a real break.