It can be dangerous walking within Active volcano places. All of the volcanoes in Hawaii volcanoes national park can be very dangerous for any visitor coming to this park. Fumes, coastline collapse, spewing lava all can be dangerous. There have been widespread cases of injuries or deaths of foolish visitors who have declined to hid to instructions or warnings. It can be as hot as 1200degrees C on spewing lava. The newly formed land is thin and fragile and the volcanic fumes can be almost constant.