I'm not in FL but our climates are similar, zone 9a. I find the salvias, of which there are many, do well in full sun, humidity and heat. They come in all sizes, shapes and colors and they are pretty drought tolerant. A very tropical looking one that blooms in the fall and winter for me is Salvia involucrata or the rosebud sage. The flowers are large and hot pink. The dwarf crape myrtles, the ones that stay under 2', also thrive in sun; depending on our winters, these may or may not lose their leaves. The acalyphas love sun as do the crotons. I always tell people to drive around their community and see what is blooming.
