"Can people get any more decadent than this"
Are you kidding?
I'd deck that thing out with a steam engine powered by burning whale oil. It will be super cool to use the top of that volcano as a smoke stack. Then I would keep live peacocks on the deck so the chefs can cut their tongues out, cook then, and serve them as appetizers, Roman style. Throw the remaining bird carcasses in to the live shark tank on that back of the boat. It also needs living people furniture on the deck. It also needs a giant wrecking ball on a boom so it can smash coral reefs out of the way. And obviously the boat needs to be gold plated........ I'm sure I missed a few things.