If you want to help teach computer science to high schoolers for two hours a week (before your day job), look into TEALS [1]. It's a rewarding way to teach the next generation of technologists/citizens/people. I've been a TEALS volunteer for five years while working at Google in NYC. The students are fantastic - curious, hilarious, and wonderful to be around. It's the best part of my day. You assist students with their projects and lecture if you wish. You work with the teacher to improve assignments/projects and help them be better teachers; so you're teaching them to fish. Going in to school stabilizes my schedule and gets me into the office earlier than I would on my own. Absolutely recommend it. They also have remote teaching opportunities.

[1]: https://www.microsoft.com/en-us/teals