Scenes like this cement Kauai's reputation as the 'Garden Isle,' characterized as it is by greener-than-green valleys, waterfalls, and rainforest. Here Wailua Falls – a jaw-dropping double waterfall whose true height is disputed – thunders over a lush mountainside in the island's east. Unlike some of Hawaii's watery wonders, these falls are easy to get to, and you can also spot them in the opening credits of classic 1970s and 1980s TV show Fantasy Island.