Appropriately located on the waterfront, the Seattle Aquarium offers plenty of underwater exploration. In the Window on Washington Waters exhibit, spot native Puget Sound marine life such as salmon and sea anemones. Divers put on three shows daily to talk to aquarium visitors from underwater. Elsewhere, admire jellies, try to find the giant Pacific octopus, and feel a bumpy sea star.
https://www.seattleaquarium.org/