Oita Marine Palace Aquarium "Umitamago"

While visiting on a weekday might mean missing some shows, it's less crowded and easier to explore. The highlight is the Sea Egg show and the dolphin show, which are highly recommended. At the end of the Sea Egg show, you can go outside and touch the sea walruses; the staff are very friendly and will encourage you to get up close, making it a wonderful experience.