I've had a bunch of restaurant jobs, a few of which lead into management positions. Although I worked at at McDonald's for over 6 years and was a manager of some sort for all of that time except for 10 months, my favorite restaurant jobs have been at pizza places. The atmosphere is more relaxed and fun.
I also used to teach computer science at a community college. Given my current job and the retirement that I'm in, teaching post-retirement would benefit my retirement account.
I like helping people--particularly with technology--so with post-retirement, I would teach if the opportunity presented itself, volunteer at a grade school or high school to mentor young geeks, or help non-profits with their programming/data needs.