Posted February 17th, 2013, 07:18 AM
I realize this is a very old thread/discussion, but just in case someone else searches it, let me add a little more info about bikes on ships.
On Carnival Inspiration last year I did a behind the scenes ship tour. Down in the hold they had some bicycles. I asked the tour guide about them, and she said that they are there for the ships crew to use to explore port stops when they dock. Nice idea. So I would guess that you might be OK to take your bike with, but best to check with the ship's agent/booking agent.
Something next year
Windsor Castle - December 1976 - South Africa
MSC Sinfonia - March 2011 - Mozambique
Carnival Splendor - September 2011 - Mexican Riviera
Carnival Spirit - April 2012 - Pacific Coast
Carnival Inspiration - November 2012 - Baja Mexico
Carnival Splendor - December 2012 - Mexican Riviera