Although I've been to Honolulu at least a dozen times, I've never visited any of the other Hawaiian Islands until this trip to Maui. Our first night in was quite eventful, due to a run-in with the local Gestapo, but other than that, it was a nice change from Oahu/Honolulu.
... just a building at the commercial dock. The population on Maui is small, so there isn't a lot of industry. Besides tourism, agriculture (pineapples, sugar cane, etc.) seems to be the basis for the economy.
There is a dormant volcano that forms Haleakala National Park. You can drive right to the top, and I thought I was being super-original by doing this instead of going to the beach. It turned out I wasn't that original.
There are actually warning signs at the top reminding you just how thin the air is. Honestly, walking swiftly did seem like work. Interestingly, there were cyclists who managed to make it all the way to the top.