Going on a cruise in November. Questions?

I just got off the carnival Imagination cruise and it was great. There are lots of things to do. If you are not sure what to do at the ports they will have an excursion desk on the boat where you can book and pay for different things to do. There is always great shopping also. In cozumel we booked an excursion, and we went for a sailboat ride, snorkeling and went to a beach party for $65. For me the snorkeling alone was well worth it! I went on a diet before my cruise, and all I did was I ate six small meals a day, and I didn't eat any breads, potatoes, or sweets, and I had no drinks that were over 10 calories, and I lost 7 ibs in about 10 days.