So, we are going to Vegas in May for my girlfriends 21st (she has never been before). I've been multiple times, and have stayed in a corner suite at Aria/1BR Penthouse at Bellagio in the past. I am 22, and she will be 21. I gave her a choice of hotels, and she really likes the Cosmopolitan. While I have never stayed there, anytime I've been in it I've really enjoyed the atmosphere and have considered staying there for future trips. However, I've been reading up on it on tripadvisor and I've seen some less than desirable reviews. While I know this is inevitable with a hotel as big as this, it just seems to be rated significantly lower than Aria and other comparable hotels. I guess I have a few questions: How is the pool? While I know its a "younger" hotel, is there any pool that is moreso relaxing than partying all the time? Is the spa any good? If not, would you recommened just going to Aria/elsewhere for the spa? Experiences you have had with Cosmo (good/bad)? Looking at booking a terrace 1bdr (fountain view of course), is it a nice room?