Collo, one of the popular spots is along the Nullabor at place called 'Head of Bight'. This is the actual head of the Great Australian Bight. You will probably have to pay a small fee.
Larry
Drive down to the head of the bight about 12km off the highway,take the van down plenty of room,walk down to the observatory by the water you can just about pat the whale,s they are that close,we went there in August. Enjoy Collo.