Various rental companies at the Wailua River. (Good workout.) Join a guided group tour or rent a kayak and go it alone. Rainbow offers a half-day Kayak and Hike Tour to Secret Falls.
The Makaleha Trail in the Makaleha Mountains, near Kapaʻa on Kauaʻi, is an adventurous scramble through lush jungle, rock-strewn creek beds, and muddy river valleys, culminating at the impressive Makaleha Falls.
