You haven't had a complete vacation in San Francisco if you haven't been to Alcatraz Island. The trip starts boarding the boat in the Pier, the trip in the boat can be a little painful, just because of the cold temperatures, but you will survive it with a jacket. As soon as you arrive to the island you can go by your own, or follow the guided tour, which I recommend to do. And latter inside the main building there is an audio tour which will reveal every Alcatraz prison secret to you.

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