Radio Island Rock Jetty will be about the best you'll find. 15'viz is great here with it usually being around 3-6'. Max depth 30'. A few flounder, lots of stone crabs, a few tropicals this time of year. Make sure you dive it at SLACK TIDE, with high being the prefered one. The current rips through there pretty good any other time.
The RR tressel at the High rise is diveable, not much to see, if you CAN see, but if flounder is what you're after, that's usually good at night.
I'll be at RIRJ in the morning grabbing some stone crabs for dinner and will give you a report tommorrow