I'm looking for a horror I think is Australian about 2 blokes go on a trip to go surfing or something about they come to this bridge which they run in to 2 girls and they follow them to what is meant to be a party. Any way in the end they find out the girls are acually dead and by the end only 1 of the blokes make it bake across the bridge I can't mem much but I know it was a good movie

The movie you're looking for is 2003's "The Locals" from New Zealand. A plot summary at imdb.com reads: "Paul (Dwayne Cameron) convinces his best friend Grant (John Barker) to travel to go surfing in the weekend. They meet two girls, Lisa (Aidee Walker) and Kelly (Kate Elliot), and they invite Paul and Grant for a party. They take a short cut over an old blocked bridge and Paul loses control of the car and hits off-road. They decide to ask for help to the locals, and they find that they are in an evil place."