Tutoring would be nice. I have a particular knack with very young learners, and some ideas I'd like to try out. Since I'll be working with university students, I'll be (quietly) looking for 4-8 year old private students.
Let your Chinese coworkers know that you are interested in tutoring primary aged kids in your free time. If you are good at it, you soon won't have any free time. Word spreads THAT FAST. I wasn't even thinking about tutoring kids when I started in my current job. I made an off-hand comment to a coworker with an 8-year-old son (not even that I'd like to teach him, but that she should be speaking English to him because he was at a great age to learn easily). She hooked me up with a group of 4 girls I've now had for 4 years. Their parents talked to other parents and I tutor private kids for more hours a week than I teach at my uni job. I NEVER advertised.