Royal Caribbean passengers have criticized the cruise line for reportedly shutting down popular activities on board without telling travelers beforehand. The global vacation company is known for offering extensive water parks on its newer ships, including Category 6, with six slides for children and adults, and Splashaway Bay, featuring canons and drench buckets for younger kids. However, according to multiple passengers on Reddit, many of the slides at these waterparks, including Category 6 on the Icon of the Seas ship, were closed on a recent sailing. “We specifically booked this cruise for the water park,” one person wrote. “Unfortunately, the majority of the slides have been closed for multiple days, including sea days, with only ONE slide intermittently open.…