Toyosu Market is Tokyo's main wholesale market for seafood and produce, replacing the old inner market at Tsukiji. Visitors cannot wander the trading floor as freely as they once could at Tsukiji, but enclosed observation decks give a view of the tuna auctions and market halls.
The market is best for an early visit, followed by breakfast or lunch at one of the restaurants in the complex. Pair it with Odaiba or the remaining Tsukiji Outer Market if you want a fuller food-focused day.