I'm wondering the same thing... what's the easiest way? Maybe even buy a postard on Tuesday but then mail it Wed am at the purser's desk with that's day postage? I don't want to waste time finding someplace to mail it in port. Anyone else have any better suggestions?? How bad will the lines be at the purser's desk also and can you buy the stamps in advance for the whole cruise or by the day as far as the different countries? Sorry I am full of questions but I hate to waste time once we're on the cruise waiting in line or looking for a mailbox!!