We came to explore San Francisco on a condensed schedule, and this worked really well for us. The Alcatraz audio tour was great, flexible to stop and start at our own pace, and deep enough but not overwhelming with information.Our Big Bus Tour guide (Susanne) was excellent. We called the staff at the office at least theee Times with questions before & during our trip, and they always got us answers to resolve any uncertainties or anxietyies about our times, tours, options, and so on.