Found on: Harmony of the Seas, Royal Caribbean International
When the world’s biggest ship debuts in June 2016, it will offer a water park that's only suitable for its (mega) size. The highlight? The thrill-inducing Ultimate Abyss that spirals a harrowing 100 feet from Deck 16 to Deck 5. The ship will also have a trio of five-story slides rightly dubbed the Perfect Storm, and younger kids will have a spray-ground to splash around in.