A whole variety of day passes is available for the Tokyo area, however, most of them are overpriced and/or not very practical because they do not cover all of Tokyo's train and subway lines. Consequently, single tickets or prepaid cards usually come cheaper, especially if you plan your city sightseeing in a geographically wise way.
Prepaid IC cards are generally the recommended way to get around Tokyo. Prepaid cards don't give you any discounts over single tickets, but they provide convenience as you can ride virtually any train or bus in Greater Tokyo (and most other major cities in Japan) with just a simple swipe over a card reader. They can also be used to make quick purchases at a large number of shops, restaurants and tourist spots across Japan.
Two types of IC cards are available for purchase in Tokyo: Suica cards at JR stations and Pasmo cards at non-JR stations. Furthermore, eight IC cards from other major cities of Japan can also be used on the trains and buses of Tokyo, including Icoca, Kitaca, Toica, Manaca, Pitapa, Sugoca, Nimoca and Hayakaken.
Only on days when you use trains or subways a lot, can it make sense to consider one of Tokyo's day passes:
The Japan Rail Pass and JR Tokyo Wide Pass are valid only on JR trains and the Tokyo Monorail. They cannot be used on subways or any other non-JR trains.
