Horse Races and Florida Float Planes

This is from Grandpa and Grandma's vacation to Florida where they went to to a float plane show. I'm guessing the date is sometime in in the 1940's, or possibly the 1930's. I don't know where the racetrack was, or what race it is. Since they live in Cincinnati, I'm figuring it's most likely Kentucky.

If anyone in the family knows more, by all means, please let me know.