When the Icon of the Seas sets sail early next year, it will take some time to disappear from the horizon. At 1,198 feet long and a gross tonnage of 250,800, it is hard to miss.The Royal Caribbean cruise ship will have 20 decks packed with more than 20 bars and restaurants, seven pools, nine whirlpools, and six water slides, as well as mini golf, rock climbing and an arcade. It will carry up to 7,960 people — up to 5,610 guests and a crew of 2,350 to pour drinks, turn back covers, swab the decks and keep the vessel on course.Since Royal Caribbean announced this newest ship last year, it has helped to boost the company’s sales with high demand for advanced bookings.It has also become an object of fascination (and scorn) on social media.Some can’t wait to climb aboard, with rooms already se...