Surfers flock to Oahu's North Shore. Snowbirds sip mai tais under the tropical sun. Eggnog is left behind for Kona coffee. It's the Christmas-New Years stretch, which means an invasion of tourists to Hawaii. But you're not one of those obnoxious people. So to speak, dress and drive like a local (or at least a traveler with dignity), avoid these sure signs you're a tourist in Hawaii.