Yes, rock climbing and rappelling are allowed in Hawaii Volcanoes National Park. Climbing and rappelling require a permit which can be obtained from the park’s Visitor Center or online. The activity must also comply with the regulations listed on the permit to ensure safety for all visitors. Rock climbing is only permitted on designated routes that have been set up by experienced climbers, while rappelling is allowed in certain areas of the park where it does not damage any vegetation or other features. Both activities should only be attempted by those who are well-experienced and knowledgeable about proper safety procedures.