As a young, fit man, you're going to need an automatic weapon to fight off the natives in Key West. I'd suggest that you shoot at their dinks (boats, not their peckers) as they approach. This way you can hack at their fingers with a knife as they try to climb over the rail. If even on manages to get aboard, well... you have two options: either take your own life, or just grit and bear it. Anyway, good night and good luck.