She said: What's it worth

Nearly every day since I started my new job, I've walked to and from work. Not a particularly pleasant trek (up 7th avenue to Times Square), I nonetheless enjoy starting my day with a breath or two of fresh - er, relatively that is - air. What's more, most weekends, Andrew and I spend walking around the city. Up to Sarabeth's or Good Enough to Eat for breakfast or over to Cafe Lalo for some divine tiramisu after dinner. Down to Niketown to check out the new kicks or over to Barneys to peruse the beautiful Manolos.

So, my question is, what's it all worth? I mean, I know from a caloric stand point, walking is nearly as good as running. Rough rule: 1 mile traveled by foot - running or walking - burns about 100 calories. But, in terms of my workout schedule, do the extra 15 miles (2 miles x 5 days + 5 on weekends) count for anything other than an extra chocolate chip cookie or two I'm allowed to eat without feeling guilty?