You aren't suggesting Royal Caribbean drinks are watered down?!
Actually, some people can tolerate stupendous quantities of alcohol.
I weigh 116 and have a glass of Chardonnay every night. Two average size wine glasses make me woozy. More than that? I’d be on the floor.
But my old friend in San Francisco, a small woman who escaped Berlin right after the Nazis came in, could drink beer all night and never get drunk. She told me, “Your problem is, you just don’t drink enough”.