Alcatraz is a fascinating tour. To each his own though.
I agree.
We have been three times. I loved it each and every time. Once we had one of the CityPass deals with Costco and took a boat out there to just circle the island. The boat was fun, one of those big companies that takes hundreds of people at once. Anyway, that is another way to look at it, but the real history is inside.
Highly recommend the Disney museum at The Presidio, but only if you are a Disney fan. We love Walt, so it was a no-brainer for us. The buses are great in getting us to/from all of the sights.
The hop-on/hop-off bus was a wonderful experience. We did this 3 of 7 days, different routes around town. They have a deal if you want to go more than one day, and it was a deal we couldn't refuse. I loved every second, out in the wind, sitting above the fray. Very reasonable and so much history. The people are so good at telling the stories of the earthquake and the rebuilding of the city. These were exhausting days, but I loved every second.
Don't miss the cable car museum. It's on the cable car line. It's free. We also went the fire department museum, which is part of a working firehouse. Rick retired 3 years ago from Denver after 40 years of service, so we loved that museum, seeing all of the old equipment and reading about the fires after the Big One.