I first went on the evening tour of Alcatraz Island which I'd highly recommend, the prison was cast in a dark gloom which seemed appropriate as we walked around the jail cells and listened to many interesting facts on the audio tour, walked the grounds, and heard about the escape depicted in the move. Naturally, I had to go see this movie...
Watching the movie, I was very impressed with how accurate the movie mirrored what my sense of prison life and the escape would be like based on my impressions of the prison and the island during the tour. Having had walked around the space of the prison in the dim evening light really enhanced my sense of the movie's environment.
Small details like the painting of black shadows for sharp tools that they shared in the tour were also present in the movie, very authentic. The lack of action per se perfectly captures the actual mood of the prison, where boredom reigned, and I thought the film balanced this well with an entertaining cast of characters and well-timed action. Eastwood's silently intense attitude was a good fit for the role and the drama and atmosphere of the escape scene was done perfectly.
In short, I'd highly recommend the evening tour on Alcatraz, followed by a viewing of "Escape from Alcatraz", you will not be disappointed.