Soak City originally opened in 1989 as a 12-acre (4.9 ha) water park under the name WaterWorks featuring 15 water slides, a wave pool, and a lazy river ride called Action River. WaterWorks was the first themed area to be added to Kings Island since 1976, bringing the total to seven. The cost was roughly $4 million USD.
The water park was expanded in 1997 to 30 acres (12 ha). It was renamed in 2004 to Crocodile Dundee's Boomerang Bay and again in 2007 to just Boomerang Bay. On September 2, 2011, Kings Island announced a $10 million expansion would take place in the 2011–12 off-season. The expansion included the renovation of the water park's main entrance, a revamp of the existing Lazy River ride, and the construction of additional amenities. A second, larger wave pool was also added to the water park, and its name was changed to Soak City for the 2012 season.
Children's inner tube slide and splash pool located between Kangaroo Lagoon and Wallaby Wharf. Opened as part of Buccaneer Island (1997–2003). Known as Koala Splash (2004–2011)
36,000-square-foot (3,300 m2) family-friendly wave pool. Known as Surfside Bay (1997–2003), Great Barrier Reef (2004–2011).
Children's water play area with several water slides. Opened as part of Buccaneer Island (1997–2003). Known as Wallaby Wharf (2004–2011)
Lagoon-style pool complete with cascading waterfalls and in-water lounging areas. Known as Kookaburra Bay (2004–2011)
A water play area for kids themed as a pirate ship with several water slides and water cannons. Opened as part of Buccaneer Island (1997–2003). Known as Kangaroo Lagoon (2004–2011)
A four-passenger, raft ride – ProSlide Tornado model – which begins enclosed and ends with a steep drop into an open funnel. Known as Tazmanian Typhoon (2004–2011)
Four twisting body slides which descend into a splash pool. Known as The Helix (1989–2003), Down Under Thunder (2004–2011).
Three fully enclosed body slides. Known as Bonzai Pipeline (1989–2003), Bondi Pipeline (2004–2011).
Artificial wave-surfing environment that provides both curved and straight waves. Known as Wipe-Out Beach (1997–2003).
A set of four head-first, racing slides up to 50-foot (15 m) high that are enclosed during the first portion of the ride before sending riders down a series of hills to the finish. Known as Coolangatta Racer (2004–2011)
2 full sized Sand Volleyball courts.
Family-oriented, multi-level water play area complete with slides, bridges, rope ladders, and a giant dumping bucket. Known as Jackaroo Landing (2004–2011).
A 0.25-mile (0.40 km) inner tube lazy river ride revamped in 2012 that features raindrop mushrooms, geysers, waterfalls, and areas that allow interaction between riders and spectators. Known as Kings Mills Run (1989–2004), Crocodile Run (2004–2011).
A pair of classic inner-tube slides. Formerly known as Sidewinder (1989-2003), Sydney Sidewinder (2004–2011)