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My choice of non-car hobby is working with wood. I'm not particularly accomplished or good at it (who has time to play in the garage when you've got a Saab to keep on the road?), but the medium is fascinating. Wood can be forgiving and temperamental all at the same time, and each piece is entirely unique. I've built a few book cases, entertainment centers, tables, and garage shelving over the years. My favorite tool is the biscuit joiner (like this cheapo Chicago Electric version for $65, or a nicer Makita version for $177) because that thing can easy work of joining wood at various angles without the need to do all kinds of special dove tail splines and other advanced techniques that I just don't understand.
What do you enjoy doing that isn't car related? Comments below.