Well, if you live far enough away you can find a hotel room for about the same cost...with free shuttle service!
We decided we'd rather get in the day before, stay in a hotel, see Cocoa Beach and pay about the same at the hotel that we would pay for the port parking. Lots of hotels near the port have "park and cruise" specials so that you can leave your car for free at the hotel and take their shuttle to the pier.
If you are from nearby, I'd say some nice friends or relatives could drop you off!
CarnivalSensation February 2015
Carnival Dream November 2015
Carnival Fascination April 2014
Carnival Elation March 2011
Carnival Imagination Sept 2007
Carnival Sensation Dec 2006
RCI Sovereign of the Seas Sept 2006
Carnival Miracle Sept 2005
Carnival Glory Sept 2004
Carnival Fantasy Jan 2004