If you live in LA you'll need to go over at least one highway.
Edit: ITT many Americans telling me of how walkable and great their towns are. I'm happy for you but comrades, I've been to the US once and that was on a trip I won in high school so don't expect me to know the zoning plan of Providence, Wisconsin Pop. 235'489. I don't really care how lovely your city with two buslines is. For every Seattle or Chicago there are 34 Cincinnatis, Houstons and Las Vagases and approx. 234 exurbs and suburbs.
Yeah was gonna say wut. Chicago is an amazing city to get around in. The public transit there is some of the best around. Sidewalks are always clean and clear and I don't know of anywhere in the city without them. They're even trying out in some neighborhoods making walking streets; essentially weird streets that are bad for cars but good for people so that people walk on the street and cars avoid the street.
They even MANDATE BY LAW that if you're a restaurant and have outdoor sidewalk seating, you MUST put planter boxes on your fences and they must have live plants in them. Chicago is a killer city to walk around in.