Ya know, I have, or have had, many hobbies, including many of the usual suspects (hiking, camping, photography, construction, aviation, and, of course, audio), but the one thing I've kept coming back to all my life is what I call "bench metal-work", or, sometimes, "petty bracketry".
Nothing puts me in a good mood -- especially starting from a low place -- like spending a few hours in the shop working with saws, drills, files, and the like. I've got some of the big toys like MIG, TIG, plasma, lathe, but the really good part usually involves just a vice and a set of files. I think it started in 8th grade with a really great shop teacher, from whom I learned practically everything I know about this. And it may have been a reaction to my upbringing, which was not big on the manual arts.
One observation about this, and related endeavors like hand woodworking, is that folks who don't do much of it imagine that working with hand tools takes for fucking ever, so why bother. But, as you get better at it, you find that it is not all that slow and very satisfying. Try it!
--Frank