First thing we did when we got to a metro station, was to grab a free copy of the Tokyo subway/metro map(below). The good news is that the Tokyo is very well-connected with the subway system, and there is also no need to take bus or taxis; the bad news is that the map is pretty complex!
Ginza (銀座)
Ginza is one of Tokyo's main shopping areas and caters primarily to the well-heeled crowd (think Louis Vuitton). If you're like us, i.e. budget-conscious or simply not interested in luxury goods, there's nothing much to do here :D. However, what we really liked about this place is that on Sundays between late morning till evening, the main shopping street along Chuo dori (中央通り) between 1 丁目 to 8 丁目 will be closed to vehicles, and it's a real great experience to walk along the broad road on a cool Autumn afternoon.
AKB48 Cafe - Akihabara (秋葉原)
There - the origin of the famous Jpop group AKB48 in Akihabara.
There seemed to be multiple queues in front of the cafe. We weren't interested in them, so we gave it a miss.
In case you don't know who AKB48 is: