This trail is located on Mauna Loa. It is a mile long loop which goes up a mountain. The incline isn't too bad, but if you have weak knees or a heart condition you may not want to hike this trail. Dress in layers. At the lower part of the trail it was warmer, at times it got colder and once the fog rolled in, we needed our fleece jackets. Bring a rain jacket just in case. Take water and a light snack. There are no bathroom facilities here but there is a day area just before it.
It took us a couple hours to do this hike because we stopped a lot to take photos and do some bird watching. We saw a number of kalij pheasants, both male and female on and off the trail. Lots of native Hawaiian plants/trees here with excellent signage with short descriptions of the plants and a drawing of the plant/tree. There are several benches along the trail to sit and bird watch.
The beginning of the Mauna Loa trail is not too far from this trail, it's worth a quick visit even if you don't want to hike the trail (if it's not foggy).
We couldn't find an official website for this park, but this website has a lot of great information. There are no park rangers or staff here. http://www.botany.hawaii.edu/faculty/bridges/bigisland/kipukapuaulu/kipuka_puaulu.htm