I'd be prepared for more than the money argument. *Some* people are swayed by money. But it you're in charge of protecting a resource, and opening it up to the public might damage that resource, you probably don't care if they spend money in the county.
While the money argument is important, I'd stress how little damage cave divers do. How, on those rare occasions when damage occurs, we've gone after and prosecuted the guilty, PLUS restored the damage, and parks are open to far more serious threats from casual visitors.
We can enhance the visitor experience for boat riders and photographers. We can easily get on with swimmers. We can work with authorities to collect data regarding fossils, geology (and unlikely, archaeology). We have a good track record at other parks, eg. Wes Skiles Peacock Springs SP.





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