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That's all it was. I watched it because I like Kelsey Grammer, and I was curious to see if Kristen Bell can act (she can't). Seth Rogen was cast in a bad part.
What made you come to that conclusion? They didn't even tell people to book a trip there in the movie. And lots of movies showcase beautiful landscapes.
shareThe fact that the cruise was consistently shown in positive light, there were no overcrowding anywhere the whole trip, spotless everywhere, ocean is always picturesque. And staff were all very friendly. The movie did not explicitly tell viewers to book a cruise, but it's a movien length product placement like Transformers were for GM cars.
Look up what product placement is, one of the most common subliminal marketing.