I worked as a TA for chemistry laboratories. You get to know a lot of the chemistry teachers better. Fun and great way to solidify your knowledge of chemistry and improve your laboratory technique.
Some labs can be a bit boring, and you have to be on your feet the whole time, but there's always interesting conversations to be had with students to pass the time.
Once a semester you have to grade two labs for every student. There are a lot of students. Even when you skim through it, it takes many, many hours. It is horrible. But it's a small price to pay for a comfy job that bolsters your resume.