The Silverton Appeal has a picture of Rob and Kristen’s doubles, Helena Barrett and Paul Darnell, doing some stunt work. The article talks about some recent shooting in a local park. In all probability this is what Kristen was referencing In her MTV interview when she mentioned running in the tree tops. Be warned the picture is a little spoilery, so don’t click if you’d rather be surprised.
Thanks to Twilight Obsessed for the heads-up.