Oahu Neighbor is a term used to describe the two Hawaiian islands that neighbor Oahu: Kauai and Maui. Kauai is the northernmost of the main Hawaiian Islands and is known for its lush tropical rainforests and stunning beaches. Maui is the second-largest of the Hawaiian Islands and is known for its stunning beaches, lush valleys, and dramatic volcanic landscapes. Both islands are popular tourist destinations and offer a variety of activities for visitors.