Leads weekend Sunday Walks in the Park and organizes volunteer activities. Its incredibly popular Puapo‘o Lava Tube Tour (adult/child $30/25, first Wednesday and third Saturday of the month) sells out almost immediately upon being posted (six weeks in advance). Plan ahead.

For a deeper dive into the natural history of the rainforest and lava tubes, try the six-hour Wild Caves Exploration Institute (adult/child age 7–12 with lunch $200/100, every other Wednesday and Saturday).