We wound up driving this road a number of times. It is a great way to get from Kona to Hilo. The landscape near the top is awesome and you get a good perspective of the various cinder cones that have roamed Mauna Loa and Mauna Kea. The road to the top of Mauna Kea is accessed from here, as well. Do it at least once, but try to avoid going from Hilo to Kona later in the day. It can be foggy and a bit tense. Locals tend to go pretty fast, so be prepared.
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