Visit the ticket office at Pier 33 in person. They typically offer about 20 standby tickets for the evening's tours during high season.

If you cannot land on the island, you can still book a bay cruise that circles Alcatraz and offers narrated history.

Third-party companies receive specific ticket allotments from the National Park Service but must sell them as part of a package with another activity (e.g., city tours, Muir Woods, or bay cruises).