Unfortunately, there aren't many waterfalls in Oahu you can drive to and still easily visible from the road, which means that many of these waterfalls require a substantial hike.
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Escape to Hawaii's Most Beautiful Natural Waterfalls
The southeastern shores of Oahu pack quite the scenic punch. Travel along Interstate H-1 to the start of the Kalanianaole Highway (Route 72) and take in the surrounding beauty. Make your first stop in Hanauma Bay, home to a nature preserve and underwater marine park popular for snorkelers.
The recommended number of days to spend on Oahu is at least four, with 5-7 days ideal for maximizing your experience on the island. This will give you enough time to visit famous attractions like Pearl Harbor and Diamond Head while allowing some downtime at the beach or spa.
Well, you choose the route, you can linger as long as you want, and you can eat and shop along the way. The island of O?ahu is just the right size for taking a drive. It's large enough that you will not run out of things to do and sights to see yet small enough that you can complete the drive in one day.