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Kamilo Beach - Naalehu, Hawaii

When you think of Hawaii, you might think of a beach paradise. And that's exactly why so many people book to visit this island as part of their beach vacation. Of course, there are some amazing beaches - but Kamilo Beach isn't one of them. Often called "plastic beach," this place is full of garbage and marine debris that hides most of the sand. But that's not the only danger.

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This beach is also home to monk seals, who will happily charge at humans if they feel as though their space is being invaded. So, time to find another beach?