[Housetek]

japans not all about hello kitty and anime now lol, but if your already going to Shinjuku, Harajuku, and Roppongi.

Why not just visit the sega arcade and check out shinjuku at night, its beautiful.

If your in Harajuku, check out the yoyogi Temple while your there, its literally right behind the JR.

and while your in Roppongi check out Tokyo Tower and Tokyo Midtown and Roppongi Hills.
if you have kids with you try to stray away from the club/bar area.

You dont have to spend much money to enjoy Tokyo if your just sight seeing.

Tokyo Dome is a nice cheap lil amusement park.

Lots of temples and shrines to visit, you might wana check out Shibuya and Omotosando while your in the area, they are both fairly close to Harajuku.