San Francisco is built on 43 hills and surrounded by water on three sides. It has an incredible number of sights and we had just 4 days to fit as much as possible in. We started our time in the city by having drinks in the bar on the 46th floor of the Hilton - just to get an overview of the city skyline. The next morning we did a tour of Downtown San Francisco. After lunch in Fisherman's Wharf we took a boat trip out to Alcatraz Island known as The Rock. It has served as a harbour fortification, military detention centre and a maximum-security federal,penitentiary. Among the most notorious prisoners there were Al Capone, Machine Gun Kelly and Robert "Birdman" Stroud. The tour was excellent with an audio tour with the voices of actual prisoners and prison guards. The Rock offers breathtaking views of San Francisco and the Golden Gate Bridge. ...