The aspect of people in the same cabin not sharing an account is just plain silly, and totally impossible to enforce. As I recall, the username us based on your last name and room number, so I'm not sure if it's even possible for different people in the same room to have more than one account.
As for uploading pics - if you can put your pictures on a floppy disk, the cafe manager can assist you in getting those pictures uploaded - but a floppy disk is the only mechanism that they have to do this. No CF reader or USB interfaces that are exposed (so far as I know).