Oahu is 44 miles long and 30 miles wide. There are 953,000 residents, not including military personnel. The Honolulu airport is located between downtown Honolulu and Pearl Harbor. This is the only Hawaiian island where you might be OK without a rental car because public transportation and tour buses abound.
If you are still planning your vacation to Hawaii, we recommend that you DO NOT spend the whole week on Oahu. Split your time between the “concrete jungles” of Waikiki and the REAL jungles that you can find on Maui, Kauai, and the Big Island. If you never get out of Waikiki, YOU HAVEN’T REALLY SEEN HAWAII!