Hi Paul I go up there quite a bit and love it, very nice place. The nearest jetty is at Clump Point which is further north than where you are. 10 - 15km if you go by Wongaling Beach.
However if you walk down to the boat ramp in South Mission Beach (Beach Ramp) you can go on a walking trail. Walk for about 15mins you will come across a rocky out crop (can't miss it).
Caught some cod on plastic lures there and seen a guy catch 2 nice Mackerel.