Absolutely loved it. We went with a group of Friends on the night tour and I can thouroughly recommend it. You get the usual audio guide tour plus a few extra bits which they open up at night (the hospital wing etc.) The atmosphere is definately creepy (although this may also be the case during the day!) Then you can go back on the boat or hang around for an extra hour or so for the talks, We listened to 2. One about the Myths of Alcatraz (where the ghost stories come from etc.) and one called The sounds of the Slammer which was great. We were shown how the doors worked and how they all sounded when they were shut. Great fun!
The whole tour was interesting and very informative as well as being creepy and a little bit sad. It was historical but also quite a lot about the people who were in prison there.
Very interesting and well worth a visit!More