"Suica" is very convenient in Japan. Especially embedded with mobile phone (which is called "Mobile Suica"), you can charge it online (or on the air) and utilize the Suica-TEIKIKEN in it also online. Ask someone in Japan to prepaire some mobile phone with Suica functionality.
Also by the way, you can walk through IZUMI-garden and walk through a narrow path (descending slope) just besides the Swedish Embassy to KAMIYA-CHO to SHIMBASHI. It will be 30 minutes of nice walk.
