I feel like I’d sometimes like to try a job like a carpenter or builder, but simply to try building something in real life, rather than our often intangible products.
I started learning joinery a year ago. I'm still terrible at it by professional standards, but I've made some bespoke furniture pieces for our house that would have cost 2-3x what I spent in tools and materials, and I enjoyed the process.
It's definitely something you can do in your spare time, and even if you don't decide to go pro, you've still learned a valuable life skill.