We had a WONDERFUL time doing the Hop on Hop Off tour! We HIGHLY recommend the trip! Our drivers, Aaron, Ron and Jody were WONDERFUL tour guides and each added their own flair on the history and happenings of the city. Our favorite part of the trip was the Golden Gate bridge. Most say Alcatraz which we did enjoy, but were saddened at the run down out buildings. Such a sad place to visit, but the condition of the out buildings was a real let down. that has nothing to do w Viator tours but the busses do come by every 15-20 minutes, and you can get on and off at the stops. You take the a city bus to their location, which was very easy to do, and because our Hotel was on the route, several times we were dropped off right in front of our hotel. Cow Hollow, EXCELLENT place to stay Just an excellent company. We were very happy with them and highly recommend this tour. You won't be disappointed.