The lack of street trees and the wide, busy streets make SF sidewalks really unpleasant. Another thing is that so many of the row houses have garages and drivew

The lack of street trees and the wide, busy streets make SF sidewalks really unpleasant. Another thing is that so many of the row houses have garages and driveways to the street, not an alley. So not only are sidewalks uglier - in many parts of the city it's mostly pavement all around you, with walls of garage doors - but also you have to watch out for cars coming in and out of garages. Some neighborhoods in SF are really pleasant and walkable, but overall the city isn't really pedestrian-friendly at all. It's not designed for walking, and it isn't dense enough. It's more of a high-density car-oriented city, which is kind of the worst of both worlds.