Yeah, supermarkets, fast food...one of my friends works at a jewelry store.
Actually most of my friends make money illegally when I think about it.
Lifeguarding if you're certified. Easy job, great money. Depends on the place though, some only hire 18+.
Mow lawns, clean pools, etc. Just think about what you're good at. I'm a swimmer, I teach swim lessons for my team's learn to swim program.