I grew up rurally in Dorset, near Dorchester, and thus near Weymouth. I miss being able to go down to the beach easily after work. We were also close to trains to bigger towns, including London, so we might have been reliant on parents to get to the station, but not further.
You probably need to narrow down the possibilities somehow. You might not be restricted by work, but what about access to public transport, hospitals (I'd discount the Isle of Wight if you have anything less than near-perfect health,) art galleries, theatres, sports facilities? Airports or ports or Eurostar?
If you want to swim in the sea, I'd look at safer beaches, and also how clean the water is.
I would also consider driving - Devon, West Dorset and elsewhere can have narrow, single vehicle width lanes. People who aren't used to this can be a bit freaked out by driving on them, potentially reversing to passing places, and at the height of a summer's day, it can get very slow with tourists. And in winter, it's likely to mean it's icy and potentially snowed in. Rural can be great, but consider the practicalities of just how remote it might be.