You will arrive by Ferry in the evening and learn about the island as well as offer your services doing some small volunteer work as the prisoners did (but now it's for preservation of the island). You will sleep in the D-Block and return on a ferry back to San Francisco the following day.
There were 36 segregation cells, and 6 solitary confinement cells in D-Block. You'll sleep on a bunk and a mattress, with nothing else. While your door may be open, there's nowhere to go, as the only way off the island after dark is to swim. The D-block was where the most dangerous prisoners were contained, locked in their cells for 24 hours a day.
What an ideal birthday or anniversary gift, right? Maybe a couples' weekend, with 9 other couples? BYOChisel.