Goose poop
Here's my solution to the goose poop problem: a low (1 foot), flimsy fence between the beach and the lawn. Prime stomping grounds for a Canada goose are water and grass separated by a short, easy walk, plus a nice pier to rest on where they can jump into the water quickly if a dog comes along. That described our backyard last year and we had tons of goose poop (not that much of a hyperbole). This little fence, which they can easily walk over (and sometimes do), is just enough of an annoyance to the geese that they mostly choose other places to hang out. Total cost: less than $20.