Back in mid 2012, Greg Sholette presented a group project called 15 Islands for Robert Moses. I was not present to see this, but I do want to share my friend Aaron Gach's description of his perfect island. Aaron is a terrific artist and founder of the Center for Tactical Magic.
Here's a little from his description, but you can read more here.
"I envision it as an invisible island wandering through the sea. It lies just below the surface, extending into the stygian depths in the form of a great, inverted ziggurat. Some may happen upon it by accident or fate, others seek it out intentionally. To enter, one is literally sucked into it by an eldritch whirlpool that threatens madness (or worse). Once inside, the visitors encounter a vast confederation of independent lodges representing all sorts of opinions, often hostile to one another, and possessing each its own rite or constitution. "