Some days you just don't want to be bothered. You've had enough. You want to sun your scaly hide on the bank of a palm-lined swamp and not be bothered by humans swimming nearby, or having those same humans molest you. Where's an alligator to go to find such a sanctuary?
Why, beneath a sign just like this one. Such a smart gator.
In the second shot you can see just how at peace he is. Don't worry, little gator, I won't molest you. And I'll take my swim trunks and find another, less fangy hole in which to get swim.