10, 000 feet above sea level stands Haleakala, a dormant volcano with spectacular volcanic landscapes that look as if they were only created a few years ago, instead of the several hundred years that have actually passed since the last eruption. Being ten thousand feet above sea level, the air is thin and the sun intense. Don't forget the sunscreen because only a few minutes exposure could give you a sunburn that will haunt you through the rest of your trip. Despite the fact that this is Maui, beware of the weather. Rain and fog are possible at any time and high winds are common so be sure to dress in layers. All trips up the volcano made by tourists must be accompanied by a guide.