You can make the "Greater Circle Island" drive from Waikiki, through Central Oahu, along the North Shore, down the Windward coast of the island, and back over the Koolau Mountains to Honolulu/Waikiki in about 2.5 hours (depending upon traffic) with no stops.
Or, you can go in the reverse direction in about the same amount of time.
So, even with stops at the beaches, scenic points, lunch and a few visitor attractions, it can easily be accomplished in a one day tour. If you stop at the Polynesian Cultural Center, it can turn into a much longer day & evening.
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