Hey guys i need alittle help cause i can't for the life of me find the keycard i looked all over the place but i just can't find the keycard that will let me open up the tunnel to house, can you guys please tell me where it is?

find the key card in Camp Golf on a desk, not sure what desk though.

Enter the main building at Camp Golf, go straight right past a kiosk with a computer and a bored looking Ranger. Take the short hallway just behind the Ranger and enter the room on your left. Keycard is sitting on the desk in plain sight.