It's not restrictive, and is Florida. Shorts and a polo is fine, but so is dressy. I wouldn't dress like for the beach, but that's a respect thing.
Khakis and collared shirt
We saw people dressed very nicely doing an anniversary dinner and people dressed very relaxed in shorts. With the white tablecloths and candlelight maybe try something in between. Really special food.
Dressy casual. It's fine dining so shorts and a tshirt probably would be best. Wife wore a summer dress, I had khakis and a dress shirt.
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