Great place to stop! We didn't want to do the pay tour, but the restrooms were clean, there was a lot of interesting things to look at, and the guides were friendly and full of information. Next time we will do the tour for sure!
Excellent overview of the city sites! Best to get on at the main office on Jefferson so you can get a top seat, then stay on the bus the whole time. It's about 2 .5 hours, and you get a very informative narrated tour. If you get off, expect that when you get back on, you'll have lost your seat and will likely have to stand. So we took the complete tour, then on the second time around, got off where we wanted to eat lunch and didn't even try to get back on, just took an Uber back to our hotel. Wear sunscreen, and it gets colder near the Golden Gate Bridge.