Replying to Japan shopping ideas?

Alright so im heading to Japan for one week during my trip to Asia. It will be on a tour and on one day we had the choice of either going to tokyo so explore or going to disneyland. So im like fuck disneyland im adventerous motherfucker so i choce tokyo.
So what im asking is if any of you guys have ever been in Tokyo, what places should i hit up? I have a whole day. Im interested in clothing, shoes, electronics, skateboarding. Anything actually, im interested in anything that i could do for a bit. Shopping is one of my main concerns.

+K for good annswers? :D yaaaa
and im gonna try to put NS sign everywhere i go in asia so ill take pictures and put them up after i come back.