6. Kauai, Hawaii
Kauaʻi, anglicized as Kauai is geologically the second-oldest of the main Hawaiian Islands. With an area of 562.3 square miles (1,456.4 km2), it is the fourth-largest of the islands and the 21st-largest island in the United States. Nicknamed the Garden Isle, Kauaʻi lies 73 miles (117 km) across the Kauaʻi Channel, northwest of Oʻahu. It is the site of Waimea Canyon State Park and the Na Pali Coast State Park.
