Yes, this is legit.  A Duck Dynasty Cruise.  July 2014.  Mark the calendar now.

It is touted as "The ideal Family Vacation with America’s FAVORITE Family, The Robertsons! Join Willie, Phil, Jase, Jep and of course Si on a four night cruise to the Caribbean. You will get up close and personal with the entire cast of A&E's “Duck Dynasty”. Find out from Korie, Missy and Jessica what it’s really like to be married to the Robertson boys, and pull up a chair to Miss Kay’s kitchen table for a cooking class." 

Click the pic to go to the booking page.