I recently stayed at the Mandalay Bay primarily because of this pool. I had been to concerts there before and wanted to enjoy it for the beach itself. I was there on a Wednesday-Thursday at the end of May and it was still quite busy. I can imagine that it would be pretty miserable on a crowded weekend. The chairs are placed together like sardine cans. However, I still really enjoyed myself. The wave pool is great and probably the best feature is that you can't jump off the side. Therefore, you can be out in deep water and not be pestered with kids doing cannonballs constantly. The water was perfect too.
The lazy river is pretty neat. You don't need an innertube, so skip it. A noodle would have been helpful and you could probably bring your own if you had the ability. But, I enjoyed it without either.
There is also a regular pool that I didn't check out. The bathrooms were in great shape.
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