I can try and direct you to spot. Please bear in mind that I may be just a little bit off.
ok. Driving down that main road(not sure of the name) coming from pringle bay side, turn right into BASS road. follow the road till the 2nd or 3rd three way stop. Turn left and follow road( should bend to the left ). On your right you will find a kind of picnic/braai area. stop there. Walk on the board walk till you get to the water. When i was last there it illegal for bait shops to sell white mussel and red bait, so best to take some with you.
Enjoy