We are a couple in our 30's on our 4th cruise-all with Carnival. Embarkation was easy as pie, as long as you got there early enough. It was 45 minutes from arrival to boarding. We arrived at port shortly before 10am and there was already a line. We were given zone 4 passes and were grabbing lunch before 11.
TIP: Head up to Lido (deck 10 on this ship)and hit the Mongolian Wok if you like that type of food. The line is the shortest on embarkation day. Its pretty tasty. Did not care for the pizza on this ship. Did not try the Tandoor place either. Also missed the bbq place near the Red Frog pub because we spent all day in the pools. The MDR service for us with your time dining was great. We usually ate at 6 and the food was always hot.
The Red Frog Pub has the cheapest beer on board and the best, in my opinion. It is a very relaxing place to hang out and although we did not order their food, we heard it was very good. There is a guitarist in there at times.
Our 4C cabin was spacious enough. There isnt room for much more in there. I think you should add more hanging hooks to the walls for purses, robes, swimsuits. Two more would be great.