Cornwall for me. Been there a few times. Can't think of anywhere that I've been in the UK that was bad. I would love to go back to Belfast, Glasgow and Cardiff again for city breaks rather than for work which I did a few years ago.
Cornwall too, spent many a happy time there, Mr Em and I spent 10 days driving/walking around Cornwall, we stayed in Lostwithiel the whole time as the B&B was perfect, but did see much of the county.
Belfast is nice , I loved it there, we stayed with friends who’s garden was on the Loch , lovely seeing the SeaCat go by whilst sitting in their garden
we have a lot of still unspoilt places to go. sadly i don't drive, and can't manage luggage so its stay at home or take a taxi to family on the coast. its hugely expensive but its only once or twice a year, when we are allowed of course.