So would scuba santa be worth the trip down?
No, but the various shark (including some nice small hammerheads and larger reef sharks) and various tang exhibits (lots of fat, healthy powder blue, unicorn and achilles tangs on display) make the trip worth it. I visited the Newport Aquarium recently and really enjoyed it. It was my third visit since the Aquarium opened.
It would be nice to see a real living reef exhibit. They did have some fire coral and a clam in one large exhibit from the Red Sea (although fire coral are not true corals ... more closely related to jellyfish and other stinging anemones)
Nice mangrove and freshwater river/planted tank exhibits as well. Still no Discus displays, but the large freshwater angelfish display was very nice as well.