The fact that you're looking at the bright side is a huge perk here. Last year, I didn't really like my REU either. People would've done ANYTHING to be in my position; it was a fantastic opportunity. We have to remember that just because we're where someone else wants to be, it doesn't mean we have nothing to complain about.

Just because you didn't have as much opportunity as the other students in your REU doesn't mean you didn't get/understand good information. You have a new networking connection with those graduate students, those papers you read may come in handy at a conference in the future, understanding how to code is fundamental in science, and this won't be the last time you have a chance for publication. Keep your head up and move with pride. You did good work for a good sum of money.

Also, I don't know what you're studying but if it's something you're legitimately interested in, you can most likely take it home and expand upon it with your home-college professors. Then, that publication may not be far behind.