Well with your computer stalking skills getting pic should be easy. I'm guessing if it's as cool as you say it will show up on their facebook feed pretty soon. If not just take a flash drive to their house and dump the photo file on your flash drive ( you might get more interesting pictures than you were expecting though).
By the way what park did they go to?
I could steal from FB when it's eventually up (they still have people to tell in person) but I'd like to get the higher res version. I have to think of a way to get it from them and early enough that they've long forgotten about me asking for it by the wedding.
They went to a couple in UT - Arches and another one