Here are some interesting stats to consider before everyone freaks out and wonders if they are going to encounter something that will kill them while on vacation:
38 of the 44 species of snakes found in Florida are NON-venomous.
3 of the 6 venomous snakes are rattlesnakes. With the exception of the pygmy, you will hear it before you see it. The pygmy is normally quite small.
The eastern coral snake is a colorful red, black, and yellow snake. Their fangs are further back in their mouth. Many bites do not even transmit venom.
The southern copperhead is more of a worry. These are quite colorful red/orange/amber colored. They can be fiesty, but like all snakes, tend to shy away from a lot of walking traffic.
The ONLY venomous snake that the one in France could have been is the cottonmouth (also called water mocassin). These are mostly dark or black with lighter colored markings on the head. They get their name from the cotton white lining of their mouth that they display when threatened. Their scales are ridged, giving it a matte look. They are found all over Florida, mostly near water.
One of the most common, or certainly one of the most encountered snakes in Florida is the Southern Black Racer. These are long, slender black snakes with smooth scales. This gives them what has been described as a "satiny" appearance. They are non-venomous and, in Florida, frogs, lizards, and small snakes make up most of its diet.
Some information on this and similar snakes:
http://www.flmnh.ufl.edu/natsci/herpetology/fl-guide/Colubercpriapus.htm
It should be noted that most snakes will flee given the choice. It is only when cornered, or perhaps stepped on, that they will bite.
Ted