Although Oahu is one of the smallest of the notable Hawaiian Islands, it attracts the most tourism.  You will find more vacation rentals in Oahu than any other Hawaiian Island.  Waikiki is the most well known area and features a well know beach along with many hotels and vacation rentals.  You can also find  Kahala and Kailua vacation rentals, which offer more peaceful locations on Oahu.  You can also find more private Oahu villas and homes at Koolau.  This location gives you more of an old Hawaiian feel.  Koolau is an old Hawaiian fishing area and offers some amazing ocean frontage.