The Oregon Coast Aquarium sits on the south side of Yaquina Bay and is widely considered one of the best aquariums on the West Coast. The outdoor exhibits — sea otters, harbor seals, a vast seabird aviary, and tide-pool tanks — mirror the habitats just outside the door, while a series of acrylic tunnels lets you walk under the open-water tank surrounded by sharks, rockfish, and rays.
Plan for half a day. The Passages of the Deep walk-through, the Pacific octopus, and the puffin enclosure are highlights. Open daily; expect crowds in summer school holidays. Adults around $30; tickets cheaper if booked online. Combined tickets with the Hatfield Marine Science Center next door are available.