Hubby is always on the lookout for new adventures when we visit Hawaii. This year he found a lava tube tour touted as the longest lava tubes in the world. Still thinking we are young kids he signed us up for the three hour tour. Our fellow tour mates were thirty somethings from France calling themselves "Team France." Let me just say it was quite a workout! I hadn't brought any sturdy shoes with me on this trip so we stopped and bought some cheap shoes. By the time our tour was over the shoes were chewed up and the soles had separated form the tops and they were trash! I'd recommend this tour. Kula Kai Cavern's are located on the Mauna Loa slope near the South Point. They are estimated to be 1000 years old, one of the youngest tubes, and are several miles long. The next day I had several lovely bruises to show for my endeavors!