Impede their access to the water. I did this with a low garden edge fence along the shore. When we want to use the beach we just fold it up and put it back out when we are done. Roman candles fired over their heads works when they are on the property, but they are smart, will wait for you to leave, and come back.
There are other methods too, most have been discussed here, use the forum search function to find them.
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