Vancouver Aquarium in Stanley Park
Located in Stanley Park, the Vancouver Aquarium is well worth the visit. You can see many marine animals inside in a variety of different habitats, and you can see marine mammals in outdoor pools that also have underwater viewing windows. It takes at least a couple of hours to see everything.
Galleries include The Wild Coast, The Pacific Northwest, Arctic Canada, The Amazon Rainforest, and many more exhibits to see and interact with.
The Aquarium web site is well worth a visit for more information on all the exhibits and for details of special exhibitions, tours, feeding times, etc.