 Mobile phones may work on the highest parts of the plateau surrounding the valley but won't work in the valley.Make sure your navigation skills are adequate to route find properly, as fires in the park often clear out undergrowth, which makes finding an indistinct trail nearly impossible (although it also means that walking is much easier).Beware of snakes, especially sunning themselves on fire roads or trails and near creeks - they won't always move away when you come near, so you may end up getting uncomfortably close to one.