You can check out La Zona a big-ish mall in Kawasaki if you like to play arcade games like me lol...or even those "UFO" catchers, giant arcade area, with a lot of stores to shop around as well.
Also lots of popular places like Harajuku, Shinjuku, Shibuya etc etc.
Oh here's the link to LaZona if you're interested what you might want to see. Don't really know where you are staying but Akihabara was about 45min train ride for me so shouldn't be far for you to visit this mall either.
(there's even a map on the site using the subway lines to direct you! *Facilities/ Access* tab.)
http://www.lazona-kawasaki.com/en/Also visit the Ramen Museum, lots of different varities of Ramen to try, with an Ice Skating rink nearby.
This post was edited by louisxsioul on Jan 10 2014 03:49pm