I am debating on whether to take the Narita City Round Bus or venture to Ginza during my 9hrs layover @Narita airport. I think Narita bus is doable within the layover timeframe. However, do you think venturing out to Ginza is doable (on top of the time spending at customs/entries & transportation)? Do I need to apply for any special visa to go out of the airport and back? I hold US passport. TIA.