several bridges around mm70 and south are good, look for the one that have their own fishing walkway, and try to fish the last half of the changing tide, the slack, and the beginning of the next tide, the transition time between those has been the best for me
also the most productive has been no name key dont remember what mile marker, like 30 something i think, if you can find your way back there, walk out to where it starts getting deeper and of the flat with a big spinning rod, 30lb line class tackle and some cut bait. lots of big snapper and some tarpon. theres a bait shop right before you get on the bridge, im not saying anymore lol