Heading to Kauai? Don't forget to pack your hiking boots. You'll want to don them to trek the undulating trails of Waimea Canyon, known as the Grand Canyon of the Pacific. Encompassing a vast chunk of Kauai's western side, the canyon runs 10 miles long and nearly 3,500 feet deep. Rutted, craggy, reddish-hued lava beds and deep fissures stretch to the sky. When they catch the sunlight, they render the canyon's unusual topography a prismatic and ever-changing canvas.