Seeking a tropical paradise that's also an outdoor-adventurer's fantasy island? The oldest and fourth largest of Hawaii's main islands, Kaua'i is where nature lovers, water babies and beach bums alike come to escape. Whether hiking the velvety green Na Pali cliffs, helicoptering over the blood-red Waimea Canyon or floating in the blue bliss of Hanalei Bay, the very best of Hawaii's colorful Garden Isle is revealed in this in-depth guide.