The Hālona Blowhole is one of Hawaii's natural wonders, It was created thousands of years ago when molten lava tubes were formed from volcanic eruptions. It's a nice rest stop on your way to other adventures, and if your feeling like a dip, you can traverse on down to the beach cove, which is also know as "Secret Beach", because you can't see it from the road. Scenes from the old movie "From Here to Eternity" were filmed there.  There appears to be ample parking, as people are constantly coming and going.

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