Though it's hard to tell with only this much of him showing, I believe this is an Eastern Rat Snake. He is a non-venomous snake and seems to have a burrow under the mulch.
If anyone knows for sure, please let me know.
We also came across a small Ring-necked Snake, who was kind of cute. Also harmless. I was not fast enough with the camera to get a photo of him, he was gone in a blink.
Of course we had to go to the computer and have a discussion of venomous snakes in Florida. Lucky for us, there are only six snakes in Florida that are harmful to people.
The only one I have ever come across, is the small but deadly Coral Snake. Unfortunately as a vet tech, I saw quite a few pet deaths due to this snake. Most pets will die, even with treatment.