Cycling
My 2 cents. Look for a cheap used bike or borrow from a friend or neighbor. See if you like riding first. Go to quiet area such as a local high school, college or park. Try riding there to start. I would go to Google Maps...Type in your home town. Then go to traffic and click downward from there. You will find on the list "bicycles". click on that and it will give you the local bike routes in your town. If you want to continue go to a local bike shop to get fitted for a bike in your price range. Buy a good (expensive) lock and be sure to lock both front and back tires (including the frame). I would get a cheap helmet and buy a better one if you take up the activity more seriously. Enjoy the ride. PS I was riding yesterday and saw some local graduation celebrations at the local park...They were given bicycles for presents!! Way cool...
I agree about going somewhere wide open and without to many eyes on you for your first few rides. You will be shaky at best but it will come back to you in short order. Happy searching then riding.