What are some good ways I could help out in my community?

I live in a very small town in Oregon. Like, it's not too small, but it's not huge. We probably have about 21,000 people. I mean, we have a humane society, a homeless shelter, some nursing homes, a jail, a hospital (obviously), & that's about it for volunteering at. I'm just not sure what I could do. I would love volunteering at the jail. That may seem weird, but I really want to. I wanna study criminal justice when I go into college, but I wanna do something involving being in the jail so I can see what it's kind of like. I am 18 though if that gives me more options then it would someone younger than that, but I am a girl. So if anyone knows how I could help out, please let me know. I just graduated high school, so now I have time to get out there & do other things. Thanks :)