Caribbean Bay located in Gyeonggi-do is the best water park in South Korea, right next to Everland in Yongin. Opened in 1996, it is the Largest Indoor and Outdoor Waterpark in the world, covering a total area of about 242,321,000 square yards. Caribbean Bay is part of the Everland Resort, but requires a separate admission fee. The best rides here are: Aqualoop and Water Bobsleigh. Other rides which I recommend you try are Aquatic Center, Bay Slide and Fortress.