We are a couple in our 60's and cruised March 8-15 not realizing this was a Spring Break week when we booked it. There were about 1400 kids of all ages onboard, but that didn't really impact our great experience at all. Everyone seemed well behaved.
We spent the night before the cruise at the Sheraton Miami Airport hotel and it was a wonderful choice. We had a room facing the golf course on a high floor and never heard any airplane noise. Across from the hotel is a major transit center where we caught a city bus to Miami Beach and South Beach just to see the sights. We took a taxi to the cruise port for about $25 the next morning. Embarkation was smooth and fairly quick.
Our cabin on deck 13, aft, port side was very comfortable with plenty of storage for our things. We brought Diet Coke with us with no problem since only Pepsi products are available on the ship. The steward removed all the canned drinks when we took them out of the mini-refrigerator to have room for our Coke. We did notice more rocking movement on this ship than we experienced with other ships including the Royal Caribbean Oasis of the Sea, Carnival Freedom, and Norwegian Pearl. We never got seasick, fortunately, and the seas were pretty calm the whole week with the exception of one night.
The cabin was very nice, spacious, with lots of storage. The bathroom was very nice.