Somewhat tech-related, I like building and repairing electronics and vintage mechanical things (Singer sewing machine, old door latches, old Macintosh; you get the idea).
Bike maintenance is deeply satisfying. Especially when you go camping on a bike you’ve completely overhauled.
Listening to and playing music are important to me in ways that are difficult to describe.
And not really a hobby, but just meeting new people and neighbors and listening to them (especially people not in tech) is very rewarding.