The (quite useless) text from the strategy guide can be found here: http://www.ffextreme.com/ff10/sidequests-p1.html
You might be better off googling for that specifically or checking through the FAQs here: http://www.gamefaqs.com/console/ps2/game/197344.html
edit: and reading through the guide the sections that I've passed, I haven't missed the moon crest yet. Looks like it is near the beach I will be headed to soon.
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