We had a great time lounging at the pool & sipping on frozen pina coladas. My group of friends literally camped out there from 10am-5pm on Sat & Sun. Its super laid back with friendly workers.
The only thing that I was uncomfortable with was a group of children (ages 4-7) were there (in the hot tub) while a whole bunch of drunk people were making out, cursing and basically enjoying themselves. Not to be insensitive but its Vegas and when I think of Vegas & a pool/ hot tub at the Cosmopolitan...or any Vegas hotel for that matter, I don't think of small children being present. It was slightly annoying because people had to somewhat watch their language and actions, which we shouldn't have to do because....WE'RE IN LAS VEGAS!!!