Charley, apart from Bob's friendly assurances there really are some mean critters around once you cross the border into Queensland. You should take notice of the risks from estuarine crocodiles and box jelly-fish around Cairns, But the biggest risk to tourists in SE Queensland is drowning in the surf beaches. Swim in a patrolled area and you will be fine. Apart from that, don't spend too long in the sun and try to avoid the airline food.

Regards, John