Free Cruise from Players Club Tours

I received an invitation for a free cruise on Royal Caribbean from playersclubtours dot com. I emailed RCCL to see if they were legit and they said they are a highly reputable and respected casino travel agent and they have a very long standing relationship with them. It just seems to good to be true. It says all I pay is port fees and taxes. Am I missing something?

we received a similar offer from Norwegian. It was legit. We had to pay an administrative fee, not much, and port fees and taxes.