Join Date: May 2002
Location: Pittsburgh
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Posts: 31,678
The JW Marriott in Ko Olina is more secluded than the places I've stayed in Ka'anapali or Poipu. It's not Hana, but it's out of the core of Waikiki/Honolulu. It also has access to the North Shore beaches without going through the heart of the traffic.
You can certainly spend 4 days on Oahu and not even touch Waikiki, Diamond Head, Pearl, and the other "crowded" spots. 8 might be a bit much though. 4/4 or 5/3 sounds right.