The best cities for pedestrians: Hit the street
I'm astonished you didn't include San Francisco. It's a wonderful city to walk in, with views of the Bay from many vantage points. If the hills are too much of a challenge, what better way to get up or down them than on a cable car? And there's a good bus system if you want to ride and then walk.
... when you start your car and press the gas you do not keep going until you hit a wall. ... Cars could not move without friction between the tires and the street. http://drglickert.com
You missed one of the world's best walking cities: Amsterdam. The very large Centre City--the Canal District--is far more walkable than Hong Kong or New York. There are hardly any cars in that area--mostlyi bicycles--and the cobblestone streets are very narrow with very little parking. You can walk for hours in Amsterdam and you'll see 10 times more bikes than cars.