You'll find a variety of family-friendly activities at this nautical festival, which commemorates the opening of Tokyo Port to international trade in 1941. It takes place over two days at the Tokyo International Cruise Terminal, where you’ll get to take a tour of Japan Coast Guard survey vessel Heiyo, the city-owned dredging vessel Kairyu and a frigate from the Japan Maritime Self-Defence Force. You can also ride the 50-minute Tokyo Port Cruise for free (times unannounced for 2026) without any reservations (limited to 300 people per session).
Away from the boats, you can feast on food truck bites, watch stage performances like cheerleading, musical performances, detector dog demonstrations and plays, take a look inside freezer storage, and watch a demonstration of the workings of an ocean cleanup vessel.