This geocache, called Nu’uanu Avalanche, is a subtype called an Earth Cache. Earth caches highlights certain features of the earth and you have to answer questions in order to log them. Many Earth Caches are about geology, particularly rocks and rock formations. This one was about wind. You had to print out a wind gauge, bring it along to the cache, and estimate how strong the wind was going to be. Then you needed to take a picture of yourself holding the wind gauge to show how strong it really was.
Here are my daughter and I holding the wind gauge my husband printed out, which is basically useless in this much wind. The little string that is supposed to be displaced proportionally to wind strength has blown all the way over to one side. But you get the idea if you look at our hair. This is the windiest spot on Oahu!
This spot is also at the top of a cliff with a spectacular view. A landslide formed this cliff, and a historic battle was fought here, in which King Kamehameha defeated the forces of Maui and united the Hawaiian islands under his rule.