I print out my cruise documents and my fun pass. You don't have to present them but I take them just in case
Life is too short to let the ship of your dreams sail without you.
Carnival Destiny Feb. 2006
Carnival Fascination Feb. 2007
Royal Caribbean Grandeur of the Seas Feb. 2008 The DTW & MsBJ tour
Carnival Valor MsBJ and Dina Feb. 2009
Carnival Glory MsBJ and Dina Feb. 2010
Carnival Dream MsBJ and Dina Feb. 2011
Just be sure you print out the "Fun Pass". That's what they'll want to see, along with your passport. You can also print out your baggage tags if you're so inclined, or you can get them from the porters when you drop your checked luggage. Either way works for the tags.
You will also need your credit card that you will plan to use for your sail & sign. At the check-in desk the agents will need it to swipe it to activate your account.
Turn off your mind, relax, and float downstream
Jubilee July '86
Celebration May '88
Fantasy June '90
Sovereign of the Seas May '93
Windjammer Polynesia June '06
Carnival Triumph May '07
Carnival Freedom Dec.'07
Carnival Imagination Oct.'08
Carnival Destiny Dec.'08
Carnival Liberty May '09
Carnival Freedom Nov.'09
Look at your cruise docs carefully. If you have eDoc they are your ticket. If you purchased transfers from Carnival there is a page you need to print for them.
I'm a little AR - I print the whole pile "just in case".
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014