I don't think I've heard of anyone being attacked by a gator who wasn't in the water with the gator. They will jump out and get a dog on a bank near to the water, since dog is high on their preferred food list. So do not walk your dog on a water edge in south Florida. Human attacks are very rare, I haven't heard of one for years. But there is no question that the gators inside the national park are more aggressive than gators to the north. Years of people killing the aggressive ones seems to have had an affect on them.