I like your logic, Dallas W!
I believe someone here mentioned the bridge over Lake Jessup being one that, as you drive over it, you can see the alligators popping their heads out of the water. Can't remember exactly how it was worded, but when I envision this scene occurring at night, it terrifies me.
So now, I wonder how much effort KC would have exerted into body disposal. I know she's lazy and would like the least messy option available, but...
...a scene from the movie, The Bad Seed, keeps popping into my mind. At the end of the movie, the little girl, Rhoda, dons her perfect little rain gear and in the middle of the night during a terrible thunderstorm walks to the edge of a slippery pier to retrieve something that was left there (don't want to ruin the story for anyone who hasn't seen this incredible gem of a movie).
Now, anyone would have been terrified to venture out in the darkness during a storm and walk out to the edge of a slippery pier, especially a child. I was struck by the determination of this little sociopath who would stop at nothing and brave whatever danger she encountered, to accomplish her goal.
I know it was a movie, but as lazy as KC is, I can see her going to whatever lengths possible, whatever it takes, to hide Caylee and not get caught, even if she broke a few nails. I can see her hiking through the woods in the middle of the night. I can definitely see her standing on a bridge overlooking an alligator infested lake in the darkness of the night. Imo, as far as fearless danger, neither of these scenarios can compete with the act of killing your own child.
I have seen no fear in this woman.