After watching the volcano blast yesterday, this was their follow up touristy thing to do. We didn't check out the lava tubes as we had fish ponds on our mind:

Located on the grounds of the Mauna Lani megaresort, Kalāhuipua'a is a fascinating area with petroglyphs, lava tube dwellings, and extensive fishponds from ancient times. This isn't much of a hike -- it's a short walk along paved trails through the Mauna Lani resort near a golf course. Kalāhuipua'a means literally 'family of pigs,' but this likely was a saying for 'abundance of food' because the fishponds in the area were stocked with lots of mullet, which were sometimes called 'sea pigs' in ancient times.