From age 14 through the summer after my freshman year in college, I painted parking lots. The guy I worked for, a close friend of my Dad's, had contracts to do malls all over the eastern half of the US. I was on the road about 80% of my summers.
In college I had a coop job with a (then) major aircraft manufacturer near Dallas, but while in school I worked as a men's dorm desk clerk. I always worked the over night shift on Friday or Saturday nights, some great stories came out of that job.
After I retired, I worked for about two years for a "think tank" as a consultant. I had no intention of working post-retirement, but they contacted me and made an offer I couldn't refuse. I helped them write proposals and did some analysis, but it was a feast or famine kind of deal. I could go a month or so with nothing, then be required to write, review, or analyze something in very short order. I quit after one such assignment caused us to cancel a mini-vacation we had planned.
Best part time job I've had is taking care of my granddaughter. There is no pay, but there is overwhelming satisfaction. And how many 7 year old girls do you know who like airplanes, explosives, and football?