We love this kind of thing- non crowded, easy loop trail, lots of trees and birds, and plenty of opportunity to spot some fungus. Ample parking. Pay $2 for a guidebook and take the easy paved trail. We saw tons of invasive pheasant, they may be a bit aggressive and come looking for hand outs. We didn't see another person on the trail the whole time, very private and quiet.
We also did the drive further up Mauna Loa. Interesting, winding, some questionable pavement conditions but still do-able in a rental car. It was a looong drive to the start of the hiking trail, but the view was nice. If you have some time to kill and are searching for some solitude, take the drive.
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