Tips required for one day visit to Tokyo-URGENT

[yesh]

Hi All,

Need help from this forum members for my travel to Tokyo on 17th Dec.

My Itinerary as follows:

Arrival: Tokyo 17th Dec 2009, 1600 hrs

Will be free after 1800 hrs on 17th. Please suggest some good place for shopping electronic goods.

I will be staying in Imperial Hotel and request you to suggest for a near shopping complex. I have heard of 100 YEN shop is Tokyo, what actually it is and can I found near to the place where I stay.

18th Dec 2009, whole day meeting and evening will be free after 2000 hrs. Suggest some good place for shopping/any place which can be visited during nights.

19th Dec, Departure from Narita.

Appreciate your help at the earliest and thanks in advance.

Thank u again,
Yesh