I stayed there a couple of years ago, awesome place... I know u looking for harbour spots, i used to fish right in front of the resort, the mzingazi side there is a little jetty that sticks out across the way from the yacht mole, had some good pulls there, friend caught a 2-3kg stumpie, another guy had a big pull,took him almost out of the yacht mole, dunno what it was cos his leader was too lite, so it snapped off.
Great fishing at night... We were using dead glassies, 2-3 on a hook when he had that pull.
Good luck.