Short answer: I like to walk.
Long answer: I like to walk.
Ironically, I started walking again (around the neighborhood) to lose weight. At the peak, I was up to 12 miles per day. I started at 3:30 AM, walked for three hours, went to work, walked for three hours more in the late afternoon, made dinner (a very frugal one) for my family, collapsed or went back to the observatory to do a program, and got up at 3:30 to start the process anew.
-100 pounds later, I discovered that the neighborhood was a boring walk, and I needed the stimulation of the (very) occasional decent views from local metro parks.
Now, I walk into the deeper woods of the national and state forests of Ohio because I like the views and the solitude.
As I've said here before, I love people. I love them even more when I can spend a day or two away from them. I have learned to love the solitude of stealth camping deep in the woods with only the yipping of the coyotes, the chirping of the birds, the sizzling trills of the cicadas, and the hooting of the owls as my companions.
Mostly, in other words, I like to walk away for a while from our somewhat sad civilization -- our screens and mini-malls -- into the vibrant simplicity of the woods. And I am at my happiest when nothing dies at my hand when I am there, when nature is simply able to forget my presence, when I leave no trace of the complex carnage that is my life outside the woods, when I don't help to kill the thing I love.
That's it. I like to walk.