How do I keep cats out of a sand volleyball court?

Last year, our park district set up a sand volleyball court and it was working out splendedly until late in the season when the cats moved in and made the court their own personal sandbox... which I don't need to tell you led to nobody using the court anymore. We cannot use a fence because of where the court... show more Last year, our park district set up a sand volleyball court and it was working out splendedly until late in the season when the cats moved in and made the court their own personal sandbox... which I don't need to tell you led to nobody using the court anymore.

We cannot use a fence because of where the court is located and we really don't want to resort to feline homicide.

Any suggestions to what we can do to make the court less appealing to these animals?
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