I just got back from a 3 night cruise to hell, at least from a recently single 20 year olds POV. It was absolutely one of the most boring cruises I have ever been on. The decks were all cleared by 11 p.m. and none of the bars or night clubs had anything going on, either. Heck, the hot tubs were closed by 1 a.m. I had never seen so many muslims on a cruise, either. They out numbered any other group on the boat by 2:1. It's not that I have anything against them, it's the fact that they are very rude people as a whole. Also, I thought R.C. supported cougars. All that I saw were coyotes. My suggestion is that if you are looking for a party, do not go on Royal Caribbean during a holiday. In my opinion Carnival has much younger crowds.
Also, the deep water dolphin swim at Atlantis is a COMPLETE rip off! Online it says it take 3-4 hours to complete and that you get to use the water park You're only in the water with the dolphins for about 45 minutes. The rest of the time you spend walking to and from the ferry. You get pushed in the water by a dolphin for about one minute. Then, you get pulled in the water by the Sea Doo seascooters for roughly 10 minutes. After that you tok a couple of pictures. All in all it was a waste of money. Discovery Cove in Orlando is much more worth it and it is half the price of the one at Atlantis.