Also popular are Haleakala National Park, on Maui, and Hawaii Volcanoes National Park, on Hawaii, as well as numerous state parks and recreation areas. Transportation Airplanes and ships are Hawaii's chief means of transport for intrastate, interstate, and international commerce. There are public bus systems on Oahu and Hawaii islands, and the state has a few kilometers of operated railroad track. Of Hawaii's airports the busiest is Honolulu International. By the mid-1980s, Hawaii had an installed electricity generating capacity of 1.6 million kW, and annual production was about 6.6 billion kWh.
Electricity is generated in thermal plants using imported petroleum.
These people, who had traveled across the ocean in large sailing canoes, were able to make implements and structures, and they enjoyed an excellent standard of living in Hawaii. Their economy was based on ahupuaa, land units that extended from mountaintop to the sea. The highest tribunal in Hawaii is the supreme court, composed of a chief justice and 4 associate justices, all appointed by the governor to 10-year terms. The state is divided into 5 counties, which, because there are no separately incorporated cities or towns, are the only units of government below the state level. Each county is governed by an elected mayor and council.