I'll go you one further.
Outsider visits island for a few months and enjoys their time there, makes some great friends. Outsider's friend has a hotel, and wants to attract more clients. Outsider has a knack for storytelling, but hasn't been successful for a few years.
Outsider spins yarn, friend fills up his hotel, both walk away happy.
End of mystery.
There are a million ways to fill in the blanks. We can't know _the truth_. I find this upsetting, and it'll bug me for days. but then I'll forget and it's ok.
Your pat story is fine too. I REALLY want to know the truth, which is a fantastic hook. so I'm stuck with this story longer than you are.