Physical labor. A friend of mine has a job like this, in their parents' egg wholesaler business. It's a hard job, but has two major benefits: keeps him in good physical shape, and lets him listen to audiobooks pretty much the whole time. I sometimes find myself envying him that.

For one, I thought I read way too much sci-fi in my life, but it turns out he's listened to every single book I did, every one I have on my "to read" list (except maybe Greg Egan stuff), and then a couple dozen ones I never heard of.