re: What hobbies do you do by yourself?

Write
Cut down dead trees and cut, split and stack firewood. Very cathartic and we heat with only a wood stove so worth the time. I always listen to a book or podcast during.

Run in woods/up mountains. Slowly.

Guitar

Sit and stare blankly in the peace and quiet.

I love doing camper mods and packing/organizing for boondock camping.

This list could go on forever really. Unfortunately I have very little time along these days.