For more information about Koke'e State Park and Waimea Canyon, visit the Hawaii State Parks' website. Kauai Waimea Canyon, Wailua River Boat and Fern Grotto Tour ...

U.S. News Insider Tip: If you're lucky enough to visit Wailua Falls ... the only navigable river in Hawaii, allowing visitors to get an eyeful of the lush valley on a boat tour.