Hi Yes I have seen them in attack mode, I mostly carry a walking pole so if they get to threatening I just wave it them and they back off, I don't mind them hissing as know they are protecting there young and there has been several swans killed on the reservoir which is horrible. Take care and hope your weekend is good.
Too bad they don't offer the tax free weekend when we are down there!! It really would save a lot!! I am used to tax free clothing and foods + other things but that's the big ones and our tax is 6.255% Maybe they will! can only hope:-)D