Death Toll: At the boat house go out the front door and take a right. Keep going until you find a rock out in the water that you can jump on. There is one right before it that you can jump on that is fairly tall, don't get on it as the as you have the chance to take more damage on it. If you go to the flat rock a little farther on, that will be the one you want to jump on. Very few infected come at you while you are on it, and most of the time the Tank music goes off and then shortly goes away. Mainly keep a eye out for smokers. Once you get to the part where the boat comes, run through the water throw pipebombs to keep the infected away for the short period you need to get to the boat. I suggest one right after you get off the rock and one when you get near the dock.
Two pipebombs can be found in the second story of the boat house, and sometimes a couple will spawn outside by the turret. Make sure you grab these before starting the contact with the radio.