[Haggis]

There are many good stops to visit on the Hibiya subway line. (most of these were mentioned by SaginumaEki)

We spent the morning in Roppongi, went for lunch in Ginza, headed up to Ueno to spend the afternoon, and then went to Akihabara in the evening. Good day out for the whole family I think. (as long as you're careful where you go in Akihabara).

If you want good nightlife that the whole family can enjoy check out Shibuya.

Oh and if you don't want to be adventurous with the food, you can just get a pizza at any of these places.