hi Chris, you can access Carpenters from Mt Gambier ,drive all the way through town ,and you will see the sign at the roundabout , turn left follow that road all the way it will take you right there .frollow the signs to the lighthouse and there is camping at the lighthouse ($7.00 per night ??) drop toilet ,easy access onto the beach, a fantastic beach too i might add im pretty sure you can get there from pt Mcdonnell, you come up through the blackfella caves, have not done that trip myself ,so i cannot honestly say .but the trip from Mt Gambier is a very easy drive ,infact to the lighthouse two wheel drive all the way. if you go there a trip out to the No2 rocks to a big rockpool is the ducks nuts (if the tides are not too big wade out to the reef an catch what you want. a place i really do like cheers Graham