I recently got wind of a "when animals attack" horror flick called Grizzly Park. The film centers around 8 young delinquent adults who are sentenced to community service. They are ordered to spend a week up at "Grizzly Park" cleaning up the trails at the end of the season.
No need to worry about wild bears though. The last grizzly was shot back in 1922. Or so they thought!
The film stars Glenn Morshower of tv's 24 and Friday Night Lights, and was filmed using a live grizzly bear!