I like Bath, England. Easy train ride from London.
That sounds great- I wish I had more time to spend, but I can always file suggestions away for my next trip. :)
I agree with Bath. You could also continue by train out to Cardiff. Around London the British Museum is terrific as it's full of the plunder from the Colonial Days. Hampton Court is also a worthwhile visit. I also just enjoy wandering around the ethnic neighborhoods. Of course, the plays and musicals are great and cost less than in NY. The food department at Harrods is out of this world.
The best suggestion I could make is to take the train to Edinburgh, if you have the time.