There may be both state and federal regulations regarding "discouraging" geese. Make sure you know those!

As Sunil says, they love mowed grass beside ponds. At my father's golf club the geese are a constant nuisance for just that reason. The grounds crew rides with an Australian Shepard in their 4-wheeler. They just stop the vehicle and give the dog a command and he will quickly chase a few hundred geese off of the fairway. Some fly away, but some just head into the adjacent pond. However, if they get chased several times a day, the geese are just smart enough to move on and find some more "peaceful" lodgings.

P.S. The dog thinks he is a champion goose "herder" and is quite proud of his hard work!