Being stranded on an island is somewhat romantic.
What if your locked in a box without the need for nourishment, and the requirement is for your mental state to be kept in a state that "agrees" with society outside of the box, so that if you are ever released you would be comfortable outside. What are the requirements? Cartoons? External News? Drama?
What if: You could create a different person based on say "votes", somewhat like the Lab Rats used in the show Big Brother...what would the external society vote for as the "perfect doctored human".