I joined SK's tours based on my colleague's recommendation who works in SF. Over the course of five hours, with the assistance of photos on an ipad, SK told me so many fascinating stories about China Town and in the financial district which I would never know about if I was wandering around by myself. SK was attentive, polite, funny and very informative who's very passionate about what he does. I would absolutely recommend his tours to anyone who would like to have a good time in SF. All the best, SK and keep up the great work!