While I'm nostalgic for several of the jobs I did in high school and college, I remember hating them all and understanding why I was working hard in college.
Groundskeeper on a golf course might be decent. Cab driver doesn't sound bad, but I know I could never tolerate driving for 10-12 hours a day. In the old days, maybe bicycle messenger in NY. Anything overly repetetive, anything menial I go insane. Although farming is something I might enjoy (I'd just probably suck at it).
After long consideration, I think the winner is: gym teacher.