Before you trudge up to Pele’s volcanic eruption, take a look at its underground handiwork. Ric Elhard and Rose Herrera have explored and mapped out the labyrinth of lava tubes and caves, carved out over the past 1,000 years or so, that crisscross their property near South Point. Their “expeditions” range from the Lighted Trail tour, an easy, half-hour walk suitable for families, to longer (up to 2 hr.), more adventurous caving trips, where you crawl through tunnels and wind through labyrinthine passages (some restricted to kids 8 and older). Wear sturdy shoes.