Photography, both analog and digital. I particularly enjoy the former as no computer is involved - I stare at one all day at work, thankyouverymuch.

Ham radio, in particular tinkering and construction - I am an RF engineer by education, but work outside the field - so the hobby is a good way to at least retain some skills.

Oh, and I do traditional textile dyes for my mother and a few handfuls of her fellow weaving artisans.