This may be a silly question....but, how do you work your flights out if you want to visit two of the islands? We wanna do Oahu and the Big Island, but would you fly out of the same airport getting in and going home or fly in to one and leave from the other? Also, I assume you "island hop" via smaller planes that you can just buy tickets for when we arrive in Hawaii. Ughhh...I have no idea. Help! Thanks!