Joke aside though: I understand that what I’m outlining isn’t some magic “fix all”, and that some people are in a situation where even getting out of their chair/bed and moving to the door is an accomplishment. I’m afraid those people need more help than I can give, and I wish them the best of luck.
However, for those that can get just a litte movement outside, it’s been shown that doing so helps. My point is that you don’t need anything specific to do outside. Once you set the goal of just being outside, moving and breathing, the “things to do” will come more naturally. The most important part is getting started by trying to accomplish something like walking around the block, and take things one step at a time.