You begin inside the plantation mansion and have a small hedge maze and a two-floor building to utilize as the countless Infected swarm over the perimeter fencing. Use the radio at the far gate. Consult the Swamp Fever Campaign, paying attention to the battle at the plantation mansion, for extra information on surviving this onslaught.
Head back through the middle after the radio at the gate is used. Then spend as much time as possible on the second floor balcony of the mansion. If you’re up here, the Horde and other Infected need to climb to reach you, although it’s wise to drop down if a Charger or Tank appears (1).
If you decide to drop, you should all descend together or you’ll be overrun, and if the going gets tough, try retreating into the mansion and fleeing from room to room, where Special Infected find it harder to hunt you down (unless they’re lying in wait). Otherwise, stay in the cobblestone courtyard outside (2) where the majority of the items are. Moving into the maze is just asking to be swarmed from all sides.