Another SF bike-related event this weekend, which a friend and regular bikeit rider is helping organize:
http://sfwater.org/index.aspx?page=20&recordid=152
“Join us for a spin through the City’s streets exploring the wonderful world of wastewater. We’ll visit San Francisco’s award-winning treatment plant, pump stations, and storm drains, learning from the experts about the fascinating infrastructure beneath the city’s streets. Fun for the sewer, cycling and city enthusiast! Pick one segment or join us for all three. No rider left behind.”