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We apologize for the confusion in where the tour ends, all tours end at the same point that they started, our main tour center at Union Square, however, we do offer courtesy stops on the return at several locations including Pier 41 for customers who are going to Alcatraz Island.
After you left the tour, the bus will have returned to Union Square where you joined the bus in the morning.
Please email us at tours@graylineofsanfrancisco.com and we would be delighted to offer you a complimentary tour which will drop you off at the same point that you started.