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You'll have to go on foot from here, so park it in the garage, restock on SMG ammo for the last time, and open the door to get back outside. Sadly, once you get to Lighthouse Point you will be informed that this is the end of the road, so to speak, and that the Combine are looking for the car. Through the long tunnel up ahead is another loading screen, and on the other side you can see the road begin to approach Lighthouse Point. Once you've put any two in the power slots by the other, the gate will open and you can carry on down the road. The last one is on top of the windmill, shoot the wooden pallet to make it fall down. Alternatively, closer to the gate is an overturned bathtub punt this away to find your other car battery underneath. One is where you would naturally expect to find a car battery - in the front of a car, so find the blue wrecked car propped up on cinder blocks outside the small building and pull the car battery out of it. There are actually four you can find - one is right next to the power device on the bed frame. If you go in the building where the power line from the gate leads to, you'll find you need two more car batteries to open the gate.
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Get out and take cover as the dropships will shoot you on approach, and take out the Combine as they show up. However, a giant wooden barricade is up ahead reinforced by Combine which you can't drive through. There's a grassy hill to the right of the overturned broken tanker, use that to get past the first obstacle. Avoid the dip and the hole in the road as if you drive into this you are almost certainly going in the drink, and carry on up to the next roadblock. Once you've dealt with it all pick up the spoils (there's a health dispenser on one of the towers, too), drive past. This one is reinforced slightly, with a tower and a car trap which tries to flip your car, as well as some soldiers and rollermines. Follow the road until you come to a Combine checkpoint. Head back to your car and carry on along the grass until you can rejoin the road. Alternatively, you can avoid all of the mines if you use the gravity gun to pick up the supply from a distance. On your way down, a few more will drop out of inaccessible areas of the upper floors, so just get rid of them in the same way. Knock out some of the sea-facing windows and use the gravity gun to fire them into the ocean to destroy them. Work your way up, but be careful when you reach the prize of some suit batteries and crossbow ammo by the corpse on the top level you will be ambushed by two rollermines that fall through a hole in the ceiling.
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Kill the two soldiers, and go around the back to enter the house via a large hole in the back wall. When you get to the overturned truck and boxes just ignore it and drive off onto the grass on the right, and follow this along to the house at the end.
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