It is easy to forget and become complacent whilst travelling in the north. With the gorgeous water & hot temps it is tough not to think about having a swim to cool off. That of course changes when you get north of Fraser Island in Queensland with the very real prospect of a significantly sized saltwater croc inhabiting that same place you intend to cool off. Best rule of thumb is to read the warning signs (like this one), be extremely cautious and sensible in known croc locations.