Sometimes, it's just a scam to get your email or other personal information. Related: Royal Caribbean confiscates tech items some passengers love In some cases, it's a deal with a catch. A short weekend cruise might be dangled as the prize for sitting through a timeshare presentation or some other sort of questionable investment.

Several people say they were recently scammed into purchasing a three-day Royal Caribbean cruise to the Bahamas.

There's plenty to do on Royal Caribbean's new Utopia of the Seas cruise ship. My favorites included mini-golfing at night and a new immersive bar.