The term 'Neighbor of Oahu' refers to two Hawaiian islands, Kauai and Maui. Kauai is the fourth largest of the Hawaiian Islands and is located northwest of Oahu. It has an area of 552.3 square miles and is nicknamed the 'Garden Isle'. Maui is the second largest of the Hawaiian Islands and is located southeast of Oahu. It has an area of 727.2 square miles and is nicknamed the 'Valley Isle'. Both Kauai and Maui are popular tourist destinations due to their beautiful beaches, lush rainforests, and stunning mountain peaks.