There are primarily six major islands to visit in Hawaii: Kauai, Oahu, Molokai, Lanai, Maui and Hawaii Island. Due to shifting volcanic activity, the oldest Hawaiian island is Kauai to the northwest and the youngest is Hawaii Island to the southeast. You can see this difference by comparing the topography of these two islands: On Kauai you’ll find lush rainforests and sea cliffs worn by time along the Napali Coast. Hawaii Island features rugged lava landscapes as well as Kilauea Volcano, erupting to this day at Hawaii Volcanoes National Park.