This was the first proper cruise to the Bahamas this ship was on, and they were filming a commercial while on the cruise. The actors dancing to imaginary music, or looking romantically out over a balcony, or pretending to have fun on the waterslides (which were actually a lot of fun) were very diverse in terms of ethnicity and age. Here's an example of an older ad I found on Youtube:
However, they were not so diverse in terms of weight: All the actors are good looking and thin. From the actors we saw, you'd assume that all cruisers look like this:
Here are two examples of people from the ship. And these are not the fattest - they could walk on their own two feet, and the ship didn't list when they moved around. In the second one, use Stacy as a point of reference:
Carnival's slogan is "Carnival: The Fun Ships." Stacy suggested maybe they should be "Carnival: The Fat Ships."