Beautiful, but have sad memories of a lady sitting inside holding her deceased child and mourning. A scene not easily forgetton. Make sure you climb up to see the gargoyles up close.
Other hotels (Wynn, Cosmopolitan) have taken over as my preferred place to stay in Vegas, but Mandalay Bay is still a good choice (The Hotel is great too). Stripsteak is a great food option here, even if not staying at the hotel.