Back in January of this year, they were offering a free t-shirt if you managed to drink the menu and show them all your recipe cards. They were giving out pretty nice recipe cards that included a short blurb on the history of the region the drink represented. It was a pretty fun location on what was a fairly empty ship back in January.
If they still have this and you're going to attempt it, make sure you check what size t-shirts they have aboard. All they had left when we did it was size S shirts.