Explore the Age of Industry: Mechanicrawl 2008 Answered
The Long Now Foundation is sponsoring an event called the Mechanicrawl which takes place this weekend. In case you were wondering, the Mechanicrawl is a walking tour which explores some of the different mechanical marvels along San Francisco's North Shore (including my personal favorite, The Musee Mecanique.
I know most San Francisco natives avoid the North Shore like a tourist-filled plague, but this is a great chance to see all of those things that you might not otherwise ever bother (or get) to see. And should you happen to be amongst the plague of tourists that swarm to the city this time of year, this would be a great opportunity to take a very unique (and free) walking tour.