The World isn't a regular cruise ship. It consists of 165 apartments mostly owned by residents. A few years back the apartment price was quoted as between $2m and $15m.
I keep wondering how many guests are usually on the ship, given I assume most people who'd spend millions on a flat on a cruise ship probably have residences elsewhere too. Keep imagining it as a near ghost ship (which is not true of course - it has a crew of 280) and a monument to excess.
The island the fortress is on has goats that roam relatively free as a means to keeping the vegetation in check. I'm now picturing goats firing cannons.