Here's a handy, fun, and utterly worthless tool that calculates the Walk Score for your particular residence. Go ahead and try it. I did and found that my particular abode registers a 28 out of 100, which is considered "Poor."
But if you were to actually look at the map that comprises all those walkability components near my home, you would see a bunch of green and blue -- green for parks, and blue for water. You know why? Because I live within a half mile of two metro parks, and within a couple hundred yards of a lake.
Here's the deal: I live in the perfect neighborhood for walking, and I walk all the time. I walk through the woods. I walk along the shore of a lovely lake. And when I take a walk, those are the kinds of places I like to walk. But because I can't easily walk to a Starbucks, and because the nearest Tae Kwan Do establishment is miles away, my neighborhood is dinged for not being very walkable. Screw it. What urban moron thought that these categories would be meaningful to anyone who doesn't wear a robe and a headband all day?