When I was growing up I would go for long walks in the woods every day. I got Lyme disease before anyone knew what it was. I can still remember the doctor saying, "Well, it's arthritis, so there's no sense giving you antibiotics." My knees are pretty well shot.
The woods are overrated!
All snarking aside, I still enjoy long walks. Even when I can't get to more "natural" settings, just walking through nearby suburban neighborhoods recharges my batteries.