Since it's not far from Lyon Supply, we regularly go to the Aquarium of the Pacific in Long Beach, CA. It's especially interesting to look for new exhibits and to revisit favorites. These photos are from July 2008.
One of my favorite parts is the jellies exhibit. It used to be a large room in the front, but they've moved it to a more central part of the aquarium (although the exhibit is smaller now).
Of course the aquarium has much more sea life than just jellies!