A whirlwind of people, sights and sounds from all directions. I remember distinctly how taken aback I was during my first metro ride-- wait, is it always this crowded? Only for that to be one of the things I missed when I got home. I suggest waking up early, if only for one morning. Then you can witness not only the sun rise, but you get to experience the rare moments of a quieter Tokyo before the rest of the city wakes up.