Whirlin' Waters Adventure Park, North Charleston Wannamaker County Park
Whirlin' Waters is the biggest waterpark in the area and includes the Big Splash Tree — which features a very large bucket that dumps 1,000 gallons of water. Not all at once, of course. There's an 870-foot-long Rollin' River and the 27,000 square foot Big Kahuna wave pool. WW is open weekends until June 3, when it will remain open daily through Aug. 12.
Splash Zone, James Island County Park
A more low-key waterpark than Whirlin' Waters, Splash Zone features island-style play structures and 200-foot-long slides, along with a leisure pool and lazy river. Splash Zone opens daily starting May 29 through Aug. 12. There's also a kids splash area which is basically a glorified sprinkler system that's ideal for toddlers.
Splash Island, Mt. Pleasant Palmetto Islands County Park
Splash Island is designed for kids from toddlers to pre-teens, with slides, sprays, geysers, and waterfalls. Like Whirlin' Waters, Splash Island opens daily starting June 3.