I love aquariums. I always make sure that I visit any aquarium I can when I'm in a specific area. While the Mandalay Bay Shark Reef ain't a great aquarium, it's a nice something different on the Strip.
The way the place is laid-out is actually very much unlike most aquariums, but it allows for a lot of people to pass through and for folks to get a good look. There were all sorts of docent-types around to answer questions, which was a nice touch.
They've got some real crowd-pleasers, especially the Octopus who was playing in some sort of clear tube when I was there. There was the awesome Sea Turtle and the Croc was awesome! I missed the Kimodo though.
It's not a great aquarium, but with all the coupons and deals around, it's a value and a half.