I'd work on whatever my current hobby is. The actual hobby changes over time.
Currently, my hobby is maintaining/repairing cars. If I had more time (and space), I'd restore old cars and/or build a track car (and of course use it on track).
Unfortunately the time and space limits means I don't even have the time to finish my very long TODO list on my own car.
Unfortunately the time and space limits means I don't even have the time to finish my very long TODO list on my own car.