It is easy to travel with the subway in Tokyo, when you know the coe of the stations (for example: A-01), that you want to use. You need these codes, when you want to buy tickets (see the codes on a map above the ticket machine) or stop at your desired station (see the codes on display in train). It's more easy to relay on these numbers than on Japanese names of the stations...
Look for the place, where you want to go on Treasures of Tokyo Google Map. There you find the next Metro Station nearby and also its number. Where there are two or more numbers, there are stations with connections to different lines. These stations are marked in Orange on the map.
It may be a bit confusing, that there are two subway systems in Tokyo: Tokyo Metro and Toei Metro (operated by the Tokyo Metropolitan Bureau of Transportation). If you want to buy day passes, you can have cards for one of them or both. Toei subway has only 4 lines, so it's easy, to know these: . Asakusa Line (Code: A-..) . Mita Line (Code-I..) . Shinjuku Line (Code-S..) . Oedo Line (Code-E..)
You can download a map with all subway lines here.
There are cards for tourists for the use of both Metro Companies:
24 hours: Adult: 800 yen Child: 400 yen
48 hours: Adult: 1,200 yen Child: 600 yen
72 hours: Adult: 1,500 yen Child: 750 yen
These cards you can buy at Tokyo airports, but also in hotels (you have to show your passport).
More informations about tickets here: Tokyo Metro and Toei Metro
