Mandalay Bay is a very comfortable hotel. The accommodations here are very generous for the price. The rooms, casino, and pool are very well kept and the spa is one of the best on the strip, second to possibly Aria hotels spa. If you plan on staying at Mandalay Bay, try and make sure to still venture down the strip. There is a lot of action around Mandalay... Luxor, Excalibur, etc which are easily visited by a free tram or people movers, however so many people just get stuck at the tail end of the strip do to the location.
The Pool: Hands down the best pool I've visited. If you plan to go on the weekend or peak season be prepare for a fraternity type of environment with random drunk altercations that usually dont get any further than yelling.
Ambiance: the hotel checkin area is a Kodak destination in itself... Beautiful aquariums and decor are all throughout the hotel and casino.
Be sure to check out the shark reef while you are there. The reed is really only about an hour or so experience so be forewarned not to be too disappointed when it's not like a huge aquarium exhibit... It's Vegas :)
Great for families!!! Especially on week day visits or off season get aways!