Tokyo Monorail
The Tokyo Monorail that runs between Haneda Airport and Tokyo, with an average interval of only 4 minutes, can take you to Hamamatsucho Station in as little as 13 minutes, where a transfer to the JR Yamanote Line can be made.
I usually drive when I visit Japan, but this was my first time taking the train. It was such a unique travel experience, and I loved enjoying the beautiful scenery along the way.