No, the ideas are not copyrighted, only the literary expression of the ideas.
What Is Not Protected by Copyright?
• Ideas, procedures, methods, systems, processes, concepts,
principles, discoveries, or devices, as distinguished from a
description, explanation, or illustration
So "discoveries" such as the revelation that certain fishies prefer certain sites or "methods" such as advice on the best way to enter the water may not be copyrightable at all.
If someone were to distill all the facts, and nothing but the facts, from the dive guide in question, would it be an infringement? Facts being how to get there, best method of entry, fishies commonly found there, special details of the particular site, and of course the site name, depths, usual presence of current, parking situation, etc. You'd think someone could enter such facts in one's own database of facts, then use those facts however one wished, whether laminated, printed on pink paper, or tattooed on one's arm.
Were I the original guy accused of malicious lamination, that's what I'd do in an attempt to avoid infringement. Of course she could still try to have the poor guy arrested while he's diving on the island with the potentially infringing work in his possession (especially upon payment of a suitable bribe), but hopefully the judge would laugh it out of court (unless he happens to be her uncle).