The Supreme Court ruled that gun owners

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15. While the details it is not as broad as some posters are assuming

The default rule in Hawaii was that bringing a gun onto private property that is open to the public was prohibited without the owner’s express consent. While I don’t agree with the Court’s decision it is not as broad as some of the posts assume. First, it doesn’t apply to private property that is not generally open to the public — such as a private residence. Second, it reverses the default rule back to the one prevalent in most jurisdictions—one that puts the responsibility for barring guns from a property on the property owner. In other words, silence is presumed to be consent rather than the other way around.

So casinos, hospitals, schools etc can continue to bar people from bringing weapons onto their property.