I've personally tried fishing the keys on a kayak. Unfortunately the 3 days I was there, the wind was so strong I couldn't cast twice, or I had drifted 20 yards.
It all depends on how you'll be fishing (shore, kayak, boat, etc).
If you're fishing on shore, I'd recommend one of the many bridges. You'll see plenty of people doing so, and no advice is better than that of a local angler.
Kayak fishing, try to stay out of the wind and float around the mangroves. Don't be surprised when your eye notices a dozen of iguanas sitting in the brush! Those things are huge and plentiful at the keys.
Always pay attention to seagulls. You'll see them flocking and diving in the water. Almost a guarantee that there's a school of bait fish, and predators feeding!
Off shore, I can't give much advice on that. I'd say take a guided fishing trip. There's plenty of them at the keys.
Good luck out there!
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