Geocaching is a great way to use solve a puzzle while getting some fresh air. They are hidden in the world everywhere so you can always look for one when you have free time.
My profile can be found at the link below, so you can see how many caches I have found so far! (You have to make an account to view profiles).
https://www.geocaching.com/p/?code=PRCZYK5
Now that I have found over 50 caches, I am allowed to hide one of my own. Stay tuned!