Alcatraz was amazing and a must see while in SF. Purchasing the tickets through Viator was easy breezy. Note that the location of the departure is Pier 33 and not Fisherman's Wharf. We weren't sure of the departure location so I had to make a couple of calls to verify the name of the actual tour company and where their boats departed. The bike tour of SF wasn't exactly what we hoped for, though. Bay City Tour Co. was extremely friendly and accommodating but their bikes may need a little extra loving care. They squeaked severely when we had to brake and the chains came off on two of our four bikes. Not sure if that is an electric bike thing. The tour guide easily repaired them on the fly, though. I am not so sure it is super safe to take some of the roads we took in heavy traffic. Our guide sorta flew through some intersections and being one of the last in a line, it got hairy a couple of times. The locations they took us to were very comprehensive of the city. It was a bit too long for our group of four with two teenagers.