If you are visiting more of Japan then grab a Japan Rail Pass. This can be used on JR lines in Tokyo such as the Yamanote loop line. When I went I used it all the time to get around the city, which saved significantly on travel. It is only worth getting though if you are going to be travelling beyond the city, otherwise it's rather pricey.

Available in Japan at major railway stations for various time periods (eg 7 days, or a month).

I agreeI disagree

1.  
2. Send to friends