Minneapolis. You are right - the Greenway (MUP thing) goes forever and gets longer each year. Not for riding on at night, however. While the city puts in bike/ped paths everywhere, they forget the lights.
I will never need a car as long as I live here.
I also lived in Portland, OR for a while and found it to be even more bike-friendly than Minneapolis, or at least the bikers there are more active about their rights - my favorite Portland event: the naked midnight ride. I wasn't able to participate when I lived there, but they all rode right by my work, so I got to stand on the sidewalk and watch hundreds of beautiful naked bikers.
I wish Minneapolis had that.