Royal Caribbean’s newest cruise ship is the world’s largest. The Hero of the Seas, set to launch late next summer, includes a record-breaking water park, the most pools at sea, 28 dining options, a multi-level family treehouse, and a kinetic sculpture, just for kicks. Billed by Royal Caribbean as “the most unstoppable, incredible, revolutionary family vacation ever,” the high-stimulation vessel, which appears to have been designed by an eleven-year-old child high on cocaine, will officially open for bookings on Thursday, April 2. The Hero of the Seas belongs to Royal Caribbean’s Icon class, the cruise line’s newest generation of ships,...