I have been there - as great as those pics are, seeing it in person is amazing. I was there three years ago on my honeymoon. I think it is significantly better than any around here.
Someone working there told me the aquariums inside are hooked up/plumbed to the ocean so that a water change is as simple as turning a valve. When you look through those window pane viewers, the tanks are actualy several inches taller than what we can see so that when they do a water change, we don't see the water leaving. Somehow it's plumbed back into the tanks using the natural water as well. I don't know how legit this story is, but that's what they told me.