What’s with the walking vs owning a car? They are in no way mutually exclusive. I walked about three hours yesterday and it was easy (and I own a car too). I download things from YouTube I don’t need to watch and just start walking/hiking.
You will burn anywhere from 75-200 calories/mile walking/hiking. I did like 14 miles yesterday. I will take weight off of you or allow you to eat whatever you want the easiest vs perceived exertion.
Side benefit, the world is strange and people are weird and you get a good dose of that. Saw a ground squirrel running down a trail carrying a severed rabbits head the other day, fun!