Take a unique kayaking tour of the Na Pali Coast or the Wailua River, opt for jungle ziplines, or a Waimea Canyon downhill bike. Really it's the kayaking and ziplining that make this outfitter famous. Tandem, open-cockpit kayaks or sit-on-top, self-bailing kayaks with pedal rudders make it easy for novices, but if you get seasick, think twice.
Make tour reservations in advance. No nonswimmers or children under 12 years old. Na Pali tours run May through September.