The Shark Reef at the Mandalay Bay is a very well done exhibit. You get to learn about sharks and walk through as sharks swim overhead in glass tunnels. My only problem is like an aquarium with everything else taken out except the sharks in a small exhibit area. This would be cool except they charge $15 per adult and $10 per child to see it. If you have kids with you it would be fun and educational for them but i don’t think you are getting the best bang for the buck here. The hours are 10am to 11pm daily.