I was staying someplace in Manhattan last year, and had 24 wireless signals, about half which were free. One was called something like F*** You name of the hotel $10 fee I was in, apparently somebody next door didn't like the fact the hotel charged for service.
I've done hotel to hotel a few times, usually because one location has it and the place across the street I'm staying at doesn't.
Stinks at Hamptons because you need the access code, but I've just walked up to the desk and asked for it more then once even if I was staying in the Embassy next door that didn't have it.