I've been pondering similar ideas, and my sister (Masters in odd textiles-related field) has been searching for jobs recently, so we discussed this. Our ideas:
* Electrician and especially low-voltage electrician. Find someone to take you on first, then get into the apprenticeship program. You get paid while you learn. Low-voltage sounds especially interesting, since it's things like wiring up alarm system, and less risk of electrocuting yourself. Wiring up alarm systems sounds more hacker-ish than any paid programming job I've had. Pretty much all electrician work involves a significant amount of problem solving.
* Welding. In particular, deep sea welding, sounds... interesting. It has potential for a very good salary, though it will involve significant risk management and probably a lot of time spent away from home and family.
* Trucking. It sounds less appealing with modern trucking organizations, but if you like driving, it might be doable. Years ago, I recall reading about a British IT guy that switched to trucking who absolutely loved it.
* Physical trainer. This one is probably great if computer-related physical issues have created a passion for fitness in you. I suspect these careers will be even harder going forward, if the economy continues to drag.
* Accounting, lawyering. These exacerbate the same physical issues. Lawyering is pretty dead now, what with way too many graduates.
* Teaching. You can try to teach English overseas to dabble in it and see if you like it.
That's all I can think of off the top of my head, but I've had a few drinks. ;-)
My basic goal with an alternate career is to get exposure to new business opportunities. For example, something seemingly silly like working at a prison might allow you insight into a whole new industry, where you could write niche software and potentially earn a lot of income. Nothing will ever make me stop thinking, "aha! I could solve that with some code..."