Hey grinner. I lived up there many years ago now but that shouldn't change one of my fav spots. The banks along the north shore section near the mouth of the Maroochy river is close and very accessible from Cotton tree by boat/canoe. We used to snorkel and fish there regularly and always came home with a decent feed. You can check it out on Gogle earth, the water is deeper on that side of the river as well. Not sure on the crabs, but I'd hazard a guess and say, the cold snap would have scared them off well and good