What to do in San Fran? Aside from the typical: Alcatraz, fisherman's wharf, chinatown, etc.?

Can anyone list some cool stuff to do in San Fran area aside from the typical stuff? Not: Alcatraz, fisherman's wharf, chocolate factory, ride the trolley. How about something like: Human Mazes, permanent orienteering courses, catacombs, incredible cathedrals, dinner theaters, etc. Anything but the typical..I need some excitement! What's your secret "Shazam" place/activity? The kind of place/activity that makes you say "Wow, I've lived here my whole life and had no idea this was here!"