At the Pinai Ferry Station there are twin zombies that must be killed. The first twin is at the beach to the north of the ferry station. It will appear from the lifeguard's shack on the beach. Once you kill it, go to the billboard with the pick-up truck on top of it at south section of the ferry station. Head to the back of the billboard and climb up the ladder. You can collect sniper rifle and bait from the truck. While up there, look toward the ocean and notice that the building to the left is open. Toss the bait near the doors to draw out the other twin.