GO: LONG WEEKEND 3 Days in Kauai The northernmost of Hawaii's major islands, Kauai makes for a perfect long weekend getaway as part of a longer Hawaiian vacation on the other islands. It's the archipelago's oldest island, dating back an incredible 5.1 million years, and it boasts the prehistoric beauty to prove it. Majestic green cliffs and lush jungle scenery abound on the Garden Isle. 18 YIN YANG/GETTY IMAGES Kauai's Na Pali cliffs reach as high as 4,000 feet above the Pacific Ocean.