Haleakala National Park on the island of Maui in Hawaii is famous for two things - its sunrises, and downhill bike tours down the side of the mountain. You probably are not going to go to Maui just for the volcano - it's interesting, but not that interesting. At the top of the volcano, if it isn't clouded over, you will be able to see down the rim into the crater. It does cloud over often, or rain at the top, so check in advance before a drive. Along the drive up from the beach, you will pass through several towns in what is known as Upcountry. These towns are colder and less developed than the coastal Maui towns. It is much colder at the very top of the volcano than at sea level, so bring extra clothes.