I worked on a kids summer camp back in 1988 [ Summit Camp, Honesdale, Pennsylvania ], and managed to see a very small part of the country. Spent a bit of time in New York, LA, San Francisco, San Diego, Chicago,and Washington. Out of those there really is only one choice for me and that's New York.
I don't know if I had been seduced by all the Woody Allen films I had watched over the years but New York had a magic and romance about it that surpassed even London.
Would love to know which place you would pick Stephen.