You are right that a good kick will usually do the trick. However, a good bite to the calf from a goose, even with pants on, can be very painful. As a kid we had some domestic geese and the male was some sort of demon creature with serious anger issues. On multiple occasions it attacked me when I would be feeding the geese. While his bill was not too large, if he got purchase he would then do what I referred to as the death roll. He would twist his head around and put the weight of his body into the roll. I got a couple of good sized welts from that demon. He was a master of the sneak attack.