Mandalay Bay (but we upgraded to Delano).Since April 17th, my wife and I have stayed at and/or had rooms at the following MGM properties: Our extended stay in Las Vegas in included rooms at many resorts Excalibur: Functional, but needs a facelift.Park MGM: Smoke-free casino, not our favorite rooms.Delano: Our old favorite is still highly favored.Our top overall MGM pick: The Signature at MGM Grand.