Why don’t you experience Japanese unique event at Tsukiji Market which is the biggest and most famous fish market in the world. You should not miss Tuna Auction, where huge tuna are unloaded from docks and laid out bidding. But be warned, the auction begins from 5 am. If you don’t feel like early morning, go straight to Uogashi-Yokocho, a nearby street lined with lots of small fish restaurant for the freshest breakfast sushi imaginable. Daiwa Sushi is one I would recommend in particular.