This was a nice surprise. We had planned to see this, but hadn't located it until we made a wrong turn and there it was! The five Honolulu Botanical Parks are very under-advertised in the tour guides, probably because four of them are free like this one.
Absolutely wonderful for plant lovers, photographers, and walkers. 400 acres of lush plants at the base of the steep Ko'olau Mountains. Start at the visitor's center for map and information. It can be seen from car, but to really see all the vistas and plants, take time to follow some of the many trails and get up close up to the plants.