The aquarium was fun for my 3-year old son, but I was disappointed that it wasn't bigger. I expected a better touch pool (like with starfish and cucumbers) than what they actually had (just some rays). It's pretty pricey so I would expect to spend at least a good hour, hour and a half, being entertained but we were done looking at all the exhibits in about 40 minutes. Come on Mandalay Bay, you can do better!