As of 2026, the title for the largest waterpark at sea belongs to Category 6, located on the Icon-class ships, including Icon of the Seas and its newer sister, Star of the Seas. This massive waterpark spans over 17,000 square feet and features six record-breaking slides, including "Frightening Bolt," the tallest drop slide at sea, and "Pressure Drop," the first open free-fall slide on a cruise ship. It also features the industry's first "family raft slides" that allow four people to ride together. Beyond the onboard experience, Royal Caribbean is also expanding its land-based waterparks; the Loco Waterpark at the new "Perfect Day Mexico" is set to debut in 2027 with over 30 slides, aiming to be the largest private cruise destination waterpark in the world. For travelers in 2026, however, the Icon-class ships remain the undisputed kings of "aquatic thrills" while actually on the move, providing a scale of water-based entertainment that was previously thought impossible to engineer on a floating vessel.