There are so many nice places to go here in country! Maybe if we had an idea about what your interests are (culture, museums, history, outdoorsy, beaches, etc) - we could better advise you on something to suit?
I agree with onetiger that Cornwall is would be a great choice! We also just got back from a week's holiday at the seaside in Pembrokeshire, Wales (ok that's not England but still here in the UK), and I think we enjoyed that even more than when we went to Cornwall - but maybe it had to do with that we had much better weather this time too.
Many other lovely places to go in the UK as well - places in Scotland, Northumberland coast, lots of nice places in Yorkshire, Bath is great for a long weekend getaway (lovely spa there!).
What time of year are you going? What sort of things are you interested in seeing & doing?