You could bring a laptop with you. I will definitely bring mine, as my camera can only hold 96 pics before full at max resolution. I plan to download often, and burn CDs for all in my party (4 families) before we separate at the end of the cruise.
I don't know if these companies (below) rent laptops for certain or not, but you might try contacting them. Got these results from a Yahoo search for laptop computer rental in the Port Canaveral area:
Smart Business Machines-Computers
(321) 453-0008 1133 N Courtenay Pkwy
Merritt Island, FL
5.7 miles from Port Canaveral
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Rentway
(321) 690-1870 801 Dixon Blvd
Cocoa, FL
7.9 miles from Port Canaveral
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Rent-A-Center
(321) 632-5555 214 Barton Blvd
Rockledge, FL
8.4 miles from Port Canaveral
You would certainly think that would be lucrative business(camera and laptop rental) as thousands use Port Canaveral to cruise from each week.