We are not big on "touristy tours" when we travel, but wanted to get a quick look at the Golden Gate Bridge and Alcatraz. This one-hour tour was perfect for us. It was not too long, and the boat was not crowded at all. We purchased the ticket that included the Aquarium of the Bay admission. It was convenient because the boat left every hour, and we didn't have to specify a time.
The boat was large and didn't sway too much - good for those who get seasick easily. The passengers were able to sit inside or outside, and there was a snack bar on the bottom floor. The tour took us out past Sausalito, underneath the Golden Gate Bridge, and circled Alcatraz on our way back to the docks. I enjoyed the commentary and historical accounts on building the bridge, as well as some of the stories about the prisoners of Alcatraz. One tip is to bring a jacket - it is much cooler and windier out on the bay!
I recommend this tour, because in just over an hour, we were able to see many of the main tourist sites of San Francisco and also took some great pictures.