The Grizzly Park Myspace has posted a blog with a link to a behind-the-scenes article at CHUD.com about the shooting of Grizzly Park. I recommend you go read it, it's got a lot of new information about the movie.
The person who wrote the article visited the set on a typical shooting day and basically wrote down what he observed. He's also thrown in some more information he learned after the visit (he's even seen a rough cut of the movie).
I can't wait for summer now.