I went to this twice and estimate that I saw about 20% of it. It is 194 acres with an extensive trail system. It is mostly wooded and has over 5000 plant species. I think I could have easily spend a week here and visiting this again is one of the main reasons I want to travel to Oahu in the future. I found it very interesting that the annual rainfall here is 165 inches and at Waikiki about five miles away the annual rainfall is listed as 24 inches. The fee is voluntary. Note: the map gives a general idea of the layout but is not an accurate representation so it can be difficult to accurately locate yourself at times. Also, the map has a note that not all trails have been mapped.
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