No trip to Maui is complete without visiting this national park, containing the mighty volcano that gave rise to East Maui. The volcano's floor measures a whopping 7.5 miles wide, 2.5 miles long and 3000ft deep – nearly as large as Manhattan. From its towering rim there are dramatic views of its lunarlike surface. Visit the summit area or the coastal Kipahulu district. The two districts are not connected by road.