They are tough, independent and can be very mean and you never know when the will come back.
After a few golfers at a course I belonged to, were attacked and they had to fight off the critters to avoid problems. It got so bad that the golf course put in floating plastic swans (enemy of geese) that lasted long enough until the smart geese figured out the solution.
The geese are not at all "stupid" and are very smart and like to walk and graze on an area that has grass, insects and seeds. They just jump into any water for a cruise.
They can be a real challenge to control.