Would imagine that it's like most ships €10 to download your memory card to a cd. I'd say that's the way you will have to do it. It's all about making money on these ships, no facility in the internet cafe for putting your photos on the computer I don't think.
The internet is really slow anyway so dont even think about it. As Molloy points out there is a photo shop who will copy your pictures to a CD for you, at a cos.