I stayed at Mandalay Bay from a Friday to a Sunday in mid-July. There were 15 of us and we booked 4 rooms. Upon arrival, check-in took forever - make sure to plan ahead for this! There was a long line and even when we finally got to the desk it was a long process. Our 4 rooms were on the same floor but not close together. The rooms were all very nice, spacious and clean with nice large bathrooms, and a couple rooms had excellent views of the pool and the strip (I would request this when you check-in). On Saturday we hung out by the pool and reserved a cabana, the pool/beach area at Mandalay Bay is huge and the service was very good. We didn't experience the crowds that I read others dealt with and the people who were there varied from young partiers to families, so I think anyone would have a good time. We also chose to stay at Mandalay Bay because we wanted to go to a club one night and Mandalay Bay has Light right in the resort - it was a great club and people could leave whenever they wanted because they could easily walk right to their rooms. I would highly recommend Mandalay Bay for large groups staying for a short weekend that want to make the most of their stay.