The Question I posted at Yahoo.com

I am a student who is studying English in Santa Clara, CA. I want to do volunteer works. I will be worthwhile if I do volunteer works. And I think it is helpful for me to improve my English. Because I think I will get opportunity that speak in English with native. Of course, I can't speak English well. But I really want to improve it.
Last week, I asked to my English teacher, who teaches English in ESL school, about volunteer works. She introduce the Internet site, Craigslist.org. I've found at that site, but there was 1 work in Santa Clara. It was not the work which I can do. Please show me how I can find volunteer works. Thank you.