Gator Keys is an beta place. It was meant to be featured in Grand Theft Auto: Vice City and probably in Vice City Stories. Its existence was revealed in an conversation between Tommy Vercetti and Avery Carrington, which was removed from the final release of the game. Following is the conversation between Tommy and Avery:
Avery: "Hey Tommy, it's Avery! Now listen, I got me all tied up at the moment and I have a representative of mine needs chaperoning out to the Gator Keys. I'm after some land out that way, so I'm sending someone out to sweeten the deal. Could you do me a favor and make sure he gets there ok?''
Tommy: "Yeah, sure thing Avery. Where'd you want me to pick him up?''
It is plausible that the Gator Keys featured crocodiles in the game.