Your pen drive won't really be of any use to you in this case...But there are a couple of options.
The first option is to take your memory card to some place that develops digital photos, and maybe they can burn the pics onto a CD, but this option is probably not going to be feasible in a lot of places.
The second option is to get a portable hard drive and/or cd burner that can write directly from your memory card. These can be somewhat spendy, but probably worth it. Check out CNET's reviews of a bunch of them here...This is probably the best option.
The third option is just to buy more memory than you think you'll need for your trip...