My wife and I had one of the best vacations to date on this ship. Just as a reference, my wife and I are in our late 20's, early 30s with this being our 5th cruise together and 3rd with RC. We decided to take a vacation and leave the little one home and below are what I think was great, good and needed some help with the ship.
GREAT
Let's start real positive, the ship rarely feels crowded. I never felt like I was waiting in long lines or trying to navigate through people. Occasionally at peak times in the promenade you might have to weave your way through some people but overall there is so much to do everyone is spread out.
Lots of storage and didn't feel tight at all. Just be organized and you will have plenty of room. Only thing I would complain about is in the bathroom the water pressure for the stink is really high and the bowl is really shallow. Seems like a weird thing to complain about but you barely turn the water on and water just goes everywhere. You get used to just barely turning it on but first couple of times just soaks you.
Great and easy to get on and off the ship. Make sure you do fly in the day before if you are in fact flying as it does take almost an hour to get from the airport to the port.
The beach itself isn't the nicest but its so big and there is so much space I couldn't really complain. Food they served was really good just wished they had more options for drinks there.
Water so blue its very pretty to see. Been to Cozumel before so just shopped for about an hour and that was about all.