We are looking for people who are visiting SF Bay Area in the next 2 months. If you could use a free ride from SFO to anywhere in the SF Bay Area, we would be happy to meet you at the airport and give you a ride. The catch is that while you are riding with us, you will be testing our app (iPhone or Android, your device or ours - whichever you choose). The only requirement is that you must not be a San Francisco resident, because we need to test this app with visitors, rather than with locals. Feel free to refer your friends to us as well. You can contact us at info@citybot.com.
Why don't you just go to Union Square and ask people if they'll test your app in exchange for a free coffee. There are TONS of tourists around there, and a lot of them are just sitting around after a long day on their feet.