Getting around in Japan can be surprisingly easy by train. When you buy a ticket, all you need to do is look on the signboard for the price of fare to where you are going (each station accounts for departing location) then put said amount into the machine and select the price as seen on the sign. For example, Ikebukuro to Akihabara was 190 yen, so if you put 200 yen in the machine, select 190 and get 10 yen change. Much easier than New York!!
I used the trains to travel the west side of the Yamanote Line. Akihabara, Harajuku, Shibuya, Shinjuku, and Ikebukuro. I especially enjoyed the fashion capital of Shibuya. It was filled with people and had a lot of interesting stores to look in.
It also had a lot of cafes for meeting people or if you just needed a break, though they all were a tad overpriced. But it is the Time Square of Japan. I exhausted myself wandering around the side streets and really tall shopping centers.