A guided tour within Carlsbad Caverns via lantern light. This hike is relatively easy although care must be taken not to damage fragile formations along the trail.  Your guide will instruct you to stay within marked areas that are quite narrow at times.  The only source of light is a lantern that each person on the tour carries.  It simulates the candlepower that was available to the earliest explorers of the Caverns. Interesting more for the history and geology than the formations although there are plenty of sights along the way as well as a small pool.