All kinds of stuff. I went on shift at the local Fire Department. (Was already certified in the state, etc added full-time experience to my volunteer experience.) Others did forestry related projects with local parks. Some did direct engagement type activities across the city.
Depending on the High School the options are endless. I can see support to websites, data collection for GIS mapping (did some of that as well for the state forest service), etc.
A lot of issues localities have is getting the data to then even start doing something open about it. Doesn’t take a college degree to help collect and format, but teaches about the entire data management process, etc.
…it’s a good thing. 😉