Ask HN: Source of extra income, no programming involved?

Do you folks have a source of extra income which does not have anything to do with programming? It could be a non-tech job, or a non-tech business. How well does it pay off, and are you happy doing it? I ask because I'm also looking for ideas. I feel like I'll never make enough money just working on my full-time job (in tech), but I'm worried that getting freelance programming work will make me stressed and sick of writing code.