The Wailua River in Hawaii is a popular spot for locals and tourists alike. Stretching 14.5 miles, it's the only navigable river in the Hawaiian Islands, perfect for boat tours to Fern Grotto, kayaking, and water skiing. With its North and South forks merging near Wailua, this river offers scenic views, including Wailua Falls and a bird refuge. It's a must-visit destination for anyone looking to explore the natural beauty of Kauaʻi.