Best investment you can make in your vacation. The unlimited muni pass worked out great no matter where we were or where we wanted to go. To get the Aquarium, boat cruise, Exploratorium and the CA Academy of Sciences all discounted made the City Pass an exceptional value. Thank You.
Short Version: Worth every penny, saves you plenty of money, especially if you are there a while.
The details: The one problem I will share was completely my fault which is this: Don't give yourself only three days for San Francisco! We didn't get to everything we wanted to including the MOMA which we had free admission to thanks to this awesome city pass. This pass gives you free transportation for a week! That alone could pay for itself if you are there for the full seven days. But on top of that, we were able to go to the Exploratorium (incredible hands on science museum), the California Academy of Sciences (another incredible science museum with a man made rainforest you can walk through and a planetarium all in one building), and a few other great attractions. Each attraction is around $25 or more so if you get to all of them you are once again getting your money's worth. I highly recommend this pass to anybody who is visiting San Fran for the first time and is planning on visiting some of these awesome attractions (if you are not, you can just get a metro pass for three days to get around the city).
Review by Skootre, USA, December 2011
This is one of my favorite places in SF to take kids. Any age is ok though probably ages 4 and up will get the most out of the exhibits. The Exploratorium is packed on weekends so try to go early and don't rush!