I would work in agriculture, producing food and managing honeybees (currently a hobby). I think we desperately need more small, local, sustainable farming practices which inevitably will require more individuals actually engaged with food production. I would focus my time left to advancing this practice and writing about it.

My second choice would be as a researcher in a field of biology. As many others have said, the interest in tech lends to a natural interest in how humans and other life forms work, and I'd like to explore this more. The time for this has probably passed me by, sadly.