A ride on the Wailua River in Kauai

Guide Josh Horner motors a tour boat along the Wailua River as he shares local lore with his guests. The 20-mile-long river begins in Kauai’s lush interior, which gets an average of 450 inches of rain each year.

Young men and women paddle an outrigger canoe along the Wailua River. The river is the only one in the state of Hawaii that can be navigated by watercraft bigger than canoes or kayaks.

Ti plants grow in front of Fern Grotto in Wailua River State Park on Kauai. The hidden cave is accessible only by boat.

Smith’s employees entertain guests with traditional music and dance beside Fern Grotto.

Ginger plants, with their brilliant red flowers, grow along the pathway leading to Fern Grotto in Wailua River State Park.

Water from a rain shower, common on this side of Kauai, runs off the roof of a tour boat docked at Fern Grotto.

Paddle boards and kayaks are among the small watercraft that share the Wailua River with Smith’s large motorized vessels.