Corn snakes are pretty common just about everywhere in FL. I don't find them often where I live, as it's residential and really built up, but they do pretty well in habitat that is not too disturbed. I never go looking for them, I just find them here and there, usually when looking for other snakes. Corn snakes are nocturnal, so they usually are not found out and about during the day. They are commonly seen crossing roads in rural areas at night, but during the winter it's usually too cold for this. If I wanted to find corns during the winter, I'd probably go looking under trash in rural areas with a few residences. It's not uncommon to find illegal trash dumps out in the "middle of nowhere", especially if there are people living nearby. It's all about luck, though... it's very easy to go through a lot of effort and not find a single snake.