Pleasure Island was said to be in the Mediterranean, but you could get there from any dock by sailing away from land for a few hours "with intent," according to the brochure I read on the way over. Before now, I never really thought much or knew much about the place. It was just another one of the dozen or so well-known anomalies of our world.
It turns out that even the experts don't know much about it. About half the brochure was just guessing why there might be a place that hosts human visitors in luxury for a week as it remakes them into pack animals. As far as anyone knows, the donkeys just roam freely through the wild parts of the island. What the fuck was the point?
"Some speculate that Pleasure Island is a kind of self-sustaining magical reaction. Supporters of this theory claim that completing the change extinguishes the soul, releasing enough occult energy to keep the arcane wheels turning, so to speak!" The brochure was full of shit like this, presented as though they were fun little facts and not fucking terrifying.