I'm not really familiar with them, but just from looking at their website it seems like such an awesome place!
You're so lucky you get to go! Wish I lived closer, I'd never leave!
Just from that species list they have, I'd really want to see the neotropical rattler and black headed bushmaster the most. I never get tired of a good gaboon pic either. LOL I just like to ogle!
Don't sweat the specifics, I'll be thrilled with any pictures you take there, so just enjoy yourself.
I HOPE YOU HAVE A BLAST~