With more than 13 million residents to entertain, Tokyo has a lot going on. Start your morning off with breakfast sushi at the world-famous Tsukiji Fish Market then let yourself get lost in Japan's vast and interesting history at the Tokyo National Museum or the Edo-Tokyo Museum. Take an hour or two and unwind in the verdant gardens (preferably with a picnic) of the Imperial Palace or the Shinjuku Gyoen National Garden. When you're ready to take on Tokyo's mammoth shopping sc