Oahu has Wet N' Wild Hawai'i, out near Kapolei.
Kahoma Ranch is the name of the water park that Jon and Kate went to while in Hawaii. They stayed at Wailea resort.
There are several volcano-related national parks. To name a couple: Hawaii Volcanoes National Park in Hawaii and Lassen Volcanic National Park in California.
Grace Park
Hawaii state park is a state park you dumbo!
Hawaii.
Sea Life Park Hawaii was created in 1964.
Aquatica
It was aquazinta
Pacific Ocean
On the Big Island of Hawaii.
Depends what you mean by "water features." The ocean waves crashing against newly forming and newly formed lava is an impressive sight. However, there are no rivers or water falls to speak of in the park.
Mount Splashmore