there was one thread that mentioned the upgrade to the 5th person was really really really expensive. (in the $4k range?) From what I understood.. The "free" cruise is in a lower category (Cat 10 or 11?) that can only hold 4. but the only categories that can sleep 5 are the family suites Cat 4 and above, so you essentially have to pay to upgrade everyone in your party to a Cat 4... It may be cheaper to buy a seperate room for the 5th person (and you might be able to get an adjoining room?)