[A2]

Cornwall as long as the weather isn't crap as it's relaxing. There's also things like The Eden Project which is supposed to be good, and plenty of chances for long quiet walks.

Bournmouth if you're wanting nightlife, but you may have to venture outside the town as well.

Never been to Margate

The only thing I can think of worth visiting in Bath is Shakeaway. (also found in Bournemouth, Southampton, Brighton and Reading)