I know there's some cities that are biker friendly, but they seem to be far and few between. That was one of the things I liked about Washington, a lot of the cities I visited had paths for bikes, and were relatively flat enough for a bike to a good alternative to a car.
Here in the southeast, bike paths are a rare occurrence, and a lot of drivers don't realize that bikes have the same rights as drivers. I can't tell you how many times I've had people try to run me off the road. Even with all of the downsides to biking around here, there are still quite a few people who bike frequently.