I have personally used something similar when traveling a few places in Asia. For example, in Seoul, South Korea I found this organization of university studen

I have personally used something similar when traveling a few places in Asia. For example, in Seoul, South Korea I found this organization of university students who want to promote their culture and improve their English in the process. I didn't want to do the typical tourist things with my colleagues, so I had two students take me around the city for a day. They were willing to tailor their tour and activities entirely to my interests. In fact, they didn't even expect me to pay for their food or things like admission tickets to museums. I certainly wasn't going to let some university students pay for me (especially when those things were comparatively cheap to me as a foreigner). I decided to rely entirely on their recommendations as locals. I had a great time! I am inclined to organize something similar in San Francisco for tourists from across the world - meet new people and show them around for free (showing off your local pride).