an Entity references as follows:
Wailua River State Park and the Wailua Complex of Heiaus, which it includes, are located on the eastern side of the Hawaiian island of Kauai. The park consists primarily of the Wailua River valley, which is the only navigable river in Hawaii. Visitors to this park can kayak, take riverboat cruises and explore the rainforest. Even motorboats and water skiing are permissible on the river.