The official website provides this very basic map of Toyosu Market. There are three blocks/buildings all connected to each other and to Shijo-mae Station via pedestrian overpasses.

The red lines on this map show the pedestrian overpass to each block. All three buildings have a long tourist corridor with picture windows to see inside the market.

When the market is open (closed on Sun.), tourists can tour the three Toyosu Market buildings from 5 am to 5 pm. However, there's not much market action after late morning.

Besides the markets, there are sushi restaurants. The problem with this map is that it doesn't show where the restaurants are. They are in Blocks 6 and 7. Very crowded though.

Block 7 is where the tuna auctions are held, but the public won't be able to see the auction area until next Jan. But if you come here by 6 am or so, you should be able to see some tuna being hauled away on the floor. This block also has some restaurants.

Block 6 is the largest building of the three. This is where the sold tuna is carved up. This building also has a large sushi restaurant area that is not indicated on this map. The upper floor also has little shops (Uogashi Yokocho Market) for people who work at the market. They sell knives, tea, etc., and also sell to the public, but the shops close by 2 pm or so.

Block 5 is the fruit and vegetable market. Least crowded. No restaurants inside.