Getting Around Tokyo Pocket Atlas and Transportation Guide: Includes Yokohama, Kamakura, Yokota, Yokosuka, Hakone and MT Fuji - Boyé Lafayette de Mente

Great help. Although there are plenty of free maps in the country, all over H.I.S and hotels and other places, this was a great tool to plan my schedule beforehand (I admit that it was overwhelming before going, seemed all too difficult. It was, but not that much XD Too bad I couldn't use it in Yokohama, I left it in the hotel :( It has a good size. Very recommended!