MapFanWeb offers free online map search.
It's pretty handy. I allows you to search hotels, restaurants, transportation and more within the area you pick.
So if you don't know which places to go in japan, or in the area you are at, then chose tourist attraction and search, then it will give you choice of places to go in the area.
Not only Tokyo but it is applied to all the 47 prefecture in japan.
You can search hotels and restaurants even in small cities and suburb in japan.
I think this is a good map tool for searching places in japan.
Map Fan Web home page
http://www.mapfan.com/
Map Fan Web English Version top
http://www.mapfan.com/en/en_m.cgi
