I also live in Florida and shooting night baseball games in the summer can be a real trial. Big glass can take 30-45 minutes to fully acclimate. But that is the real solution - acclimation: if you plan to go out at night, put your equipment out mid-day in a garage (or other location out of the sun) and let it acclimate. Leave lens/body caps on, and if coming from AC (i.e. really cool comparatively) leave it in the case so it warms slowly (more to the point so hot humid air gets to it slowly and does not condense right then).
This is not a 100% solution as some nights here the relative humidity is so high everything gets moist, but it will get you close. A sun shade is also a good idea to keep descending moisture from it, if shooting more horizontally (but not much good shooting up, obviously). I usually put my gear in the car (in a garage) the morning before a game, give it all day to warm.
If you are near power, a hair dryer at a distance to evaporate gently any dew that falls and warm the front element slightly can also help; do not get it very warm - just a few degrees warmer than ambient (or see the heater mentioned below).
Minimize lens changes in this environment, as the rear elements and even camera internals also tend to get a damp coating (the same hair dryer -- at a distance -- will heap there if you must change, get a bit of warm, dry air inside first). Be sure all lenses and other accessories you may use are acclimated as well.
Never use canned air or any pressurized similar product to blow off/dry the lens, as that air is much cooler than ambient due to the pressure change; its cooling effect on the glass will make the situation worse.
I would avoid any treatments for optics reasons (not so much damage as clarity). Do not wipe dew-dampened lenses, ever - dust on the lens, now wet, will scratch (and because it is wet you cannot use the usual solution of a brush or blower). They must dry/warm over time. Do not be tempted to wipe "just that last bit of dew" off. Wait.
When done and back inside, leave the cameras out of the case and let them dry in the dry air inside an air conditioned environment. If there was enough dew to leave scum behind, clean it then, not in the field (usually dew is near pure water and evaporates cleanly, well, if you didn't mess with it trying to wipe it off).
Please do not take any comments above to imply you need to get the lens hot. Optics work best if they are at a stable temperature near air temperature. If you go the hair dryer route, do it VERY gently.