I have my doubt about the usefulness of masks outside where you keep 6 feet away or more, such as walking or going to the gas station. Though I haven't walked trails, they are too crowded for my taste, I walk surburbia, which has people walking of course, but it's less hard to distance.
I mask up for the grocery and even the apartment laundry room, even though the laundry room is just a rather drafty shack with only one person allowed in at a time, you never know. Otherwise this apartment building doesn't have any other shared indoor space. And I have literally been in no public places inside but the grocery and the laundry room in 2 months. One day I might have to go to the bank and I can (actually must) wear a mask to the bank now! Most everyone is wearing masks to the grocery, it's the law.