In Tokyo, I used a 3 days Subway card to move around. I do not need a card using the 4th day because as I've stated below, it is possible to walk everywhere. On the 5th day, you can either use a Suica or ICOCA card or metro-only card, or if you are here for 3 more days, buy another subway card. In my humble opinion, the Subway Visitor Card is more useful for first-time visitors than the