This might seem silly, but they are Corn snakes, look somewhere there is corn...I think they grow a lot of sweet corn around Miami-Dade Co.? Cornfields are a good place to search when the ears are on the stalks. If you find grain silos around farms etc, that is an even better place to look, as there will likely be piles of trash or some kind of nice habitat close by. Rats hang out there for the corn, snakes follow the mice. Get permission to snake hunt on someone's land though. They might like the snakes around helping them control rodents, and there may be liability issues around farms or especially around commercial grain processing plants.
Also you can go out to likely places in the winter and lay down sections of tin roofing material or similar, go back in the spring and "flip tin". Wear boots and gloves, use a stick maybe to get up under the tin--Corns aren't the only likely inhabitants. Look up as well as down, corns are somewhat arboreal. In the winter, you can think where you might like to hibernate if you were a snake, check those places. Rotting logs etc. I once found a mess of garter snakes just emerging from under one of those green electrical boxes on the side of the road in the spring.
Try not to destroy habitat in your herping. Spring is a great time to herp. Snakes, at least in my experience, seem to be more prolific then, often spotted out sunning in the afternoons. Go road cruising towards dusk. Look under everything. If you stop at a store to fill up, walk around back and flip boards, old boxes, drums, whatever, but watch where you stick your hands. You can use a mirror to shine sunlight into dark places.