Howzit Reef man,
I've fished there a few times from my experience mtunzini has alot of big long sand banks so wading is defintely the best option for bigger sharks and skates .
Also on the high tide at nite the smaller greys com on the bite quick and fast
I found the best bait for them is sugar mack fillets with belly or chocka mix
You can check for the drains when the tide is running out some good salmon
Kingies come into these drains to feed. hope I was of some help let us know how it goes also dont forget pics and video if possible.....
Cheers riymos