Try the head/party boats, lots cheaper than the charters... but lots more people too, but it is fun and you can catch some good fish if you pay attention to what other people are doing... but!... Grouper and Snapper are OOS right now.
Another venue is night fishing around piers and bridges with lights, the Snook and Tarpon really turn on at night! Drive around and look for canals with access and then fish them at night, early eve, or early morning!
You're not that far from "Alligator Alley" with it's many side roads, canals, huge Bass, Alligators, huge Pythons, and Anacondas!!!
There's also the Tamiami trail with the ditch on both sides, you'd be amazed at the fish that come out of those ditches!!!