Hawaii's most famous landmark is on Oahu.
On the plus side of the ledger Oahu has:
The traffic, congestion, and pollution can be horrible. Twice in the past week I’ve had the misfortune of trying to make an appointment during the evening rush hour. On both occasions, once in Waikiki and the other near Honolulu International Airport, it took half an hour to travel less than a mile. If one can avoid the morning or evening commute, getting around is easy.
While the beautiful people go to Lahaina, this beach, in the heart of Honolulu, has sparse attendance on a weekday.
On this trip I’ve renewed acquaintance with two vigorous individuals who are in their nineties and many others who are over 80. The experiences of these friends and relatives bode well for a retirement life on Oahu, because longevity is one of my post-retirement goals (it’s better than the alternative). Arizona is attractive, Tahoe is tempting, but Oahu is probably where I’ll end up. © 2004 Stephen Yuen
[Update - 9/8/04: this perspective on Oahu is worth checking out.]