I always get irritated by "where should I go?" posts, but here I am writing one!
My wife and I are planning a vacation based on Bristol and Bath, where there seem to be an overwhelming choice of the things we like to do. However, we'd still kind of like to spend a few days in a third place. I'm thinking of Exeter. It does have the cathedral, to start with it. How is it as a base to get out to Plymouth, Land's End, Dartmoor or Exmoor? (Not that we'd go to all of them!) We'd be traveling by bus and train. Is it feasible to visit the big parks using public transportation?
Exeter also has an airport. We're considering USA-via Dublin-Exeter, then Bath, Bristol-via Dublin-USA. Or maybe the reverse.