OSAKA AQUARIUM KAIYUKAN
Kaiyukan was the biggest aquarium in the world at the time of its opening, and is known for its sharks and rays! They have many beloved ringed seals, and other really cool pacific marine life. It even has a really cool nighttime experience where the lights are dimmed after 5 PM and you can explore the nighttime behaviors of the animals as they grow sleepy. (Sounds perfect for someone like me who gets overstimulated by bright lights!)

Note: I have no affiliation with the Osaka Aquarium Kaiyukan or any other aquariums listed here.