Waimea Canyon State Park has lookout points over Kaua'i's stunning Na Pali cliffs, as well as numerous hiking trails through and around the canyon, a wilderness lover's delight.
BBC: Hawaii for beach haters
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Way more thrilling than a day at the beach is a helicopter ride over the interior of Kaua'i, most of which is too densely forested and mountainous for wheeled vehicles.
BBC: Hawaii for beach haters
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This gigantic chasm at the heart of Kaua'i is one of the island's greatest natural wonders, and its red-and-black-striated lava-rock walls contrasted with the lush green forests that blanket its top is a true sight to behold.