What city has the best public transportation in the US?

I'm visually disabled and will need to rely on public transportation soon to get around. What city would be the best for someone who doesn't own a car or can't drive? Also, what would be wonderful is a place where you could live that has everything within walking distance. Schools, grocery store,... show more I'm visually disabled and will need to rely on public transportation soon to get around. What city would be the best for someone who doesn't own a car or can't drive? Also, what would be wonderful is a place where you could live that has everything within walking distance. Schools, grocery store, doctor, post office, ect. Kind of like a village. Does that kind of neighobrhood exist anywhere? I've been doing searches but come up with nothing. I have two children and it would be great to be able to just walk or take a subway/train/bus to whereever we need to go with out a hassle.
Thanks.
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