As a person in the know about theme parks, people planning trips to Hawaii often ask me about the islands' amusement parks and water parks. They are often surprised to discover that there are no amusement parks or theme parks. There was one, Waikiki Park, that operated in the 1920s. The small amusement park included one wooden coaster, The Big Dipper. Today, there is one water park on Oahu. And Disney's Aulani Resort, while not a water park or a theme park, has elements of both.
The following parks and properties are open on Hawaii:
Kapolei on the island of Oahu
Disney's themed resort and spa is not a theme park, per se. But it does have theme park-like elements, including water slides, interactive adventures, and Mickey Mouse and the gang.
Locations include Waiakea Center on the Big Island, Kapaa on Kauai, Kahului on Maui, and Aiea on Oahu
The chain of family entertainment centers features arcade games, some of which offer tickets for prizes.
Sea Life Park Hawaii
Oahu (near Waikiki)
Like Sea World, but without the rides. Swim with dolphins and sharks (!), feed the stingrays, watch the whales make a big splash, and other marine life attractions
Large outdoor water park with great slides and attractions. Some of the activities include a half-pipe ride, a wave pool, a bowl ride, a funnel ride, mat racing slide, family raft ride, lazy river, body slides, tube slides, and a flume slide.