It's not to far, depends on how full the lot is when you get there and how far back in it you have to park. The furtherest back is less than a quarter mile. You could drop the suitcases and one person (if they are not children) off at the front of the terminal, go park, then walk back up without the suitcases. Port Canaveral is easy to use, we've sailed out of it twice. Enjoy your cruise.
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Carnival legend November 2009
Carnival Glory October 2007
Carnival Elation November 2006