I must admit the foot people really put in some extensive criteria to come up with the 12 most walkable cities.  Here’s my take on walking through their ‘winners’:

New York, NY:  You’d walk too with such a comprehensive subway taking you to hundreds upon hundreds of dining, shopping and entertainment choices.
Philadelphia, PA:  It has one of the most village-like atmospheres of any of the big cities.
Chicago, IL:  Like NY, although the strolls are not as intense as Manhattan’s jam-packed sidewalks.
Madison, WI:  One of the best-planned small towns in the country, designed for convenient walking (before the auto era) - and it shows.
Washington, DC:  With probably the cleanest and safest subway in the world, I don’t even find myself needing a zip car in my homebase.  It helps that my commute is five blocks.
Honolulu, HI:  My home state - it’s gotta be the weather, because you really can’t get anywhere without a car here.  Although, there’s always Aloha Tower...
San Diego, CA:  With great weather and the only place with city-wide wireless internet, who needs to commute?  They’re really focused on their light rail and destination entertainment venues as well.

San Antonio, TX:  The Riverwalk is a walking destination unto itself.
Don’t know much about Jersey City, NJ; St. Louis, MO and El Paso, TX... anyone?