Oh, I hadn't thought of that with the sins and islands! Neat. Well, Sloth is Ramandu's island, with the sleepers at the table, but I find it interesting that sleep is also used there to heal. And I think the island of dreams is Pride, because it would be that to go in there at all, and also it's the most dangerous, and Pride is supposed to be the worst of the sins (and is mitigated by Temperance, i.e. not going in). Deathwater is probably Greed, and Eustace's island of the dragon is Wrath. I can't figure out the wizard's island... it might be the virtue Kindness, as the opposite of Envy. Not sure about the others.

Lewis did grow up (mostly) eventually, if you look at Till We Have Faces and parts of the Space Trilogy and most especially at A Grief Observed, which book breaks my heart but shows something of what his marriage did for him. Joy Gresham seems to have spent a great deal of time arguing with him about chivalry and adulthood and what he thought about women, and I remain sad that he didn't write more fiction after those conversations; but of course he was dealing first with her death and then with his own last illness.