In the Poipu area of Kauai, you will find an impressive blowhole called Spouting Horn.  A blowhole forms at the end of a lava tube and as waves crash in, water goes into the tube and it builds up pressure to blow the water back out.  The spouts of water can reach up to 50 feet high. Not only does the blowhole create an impressive display, but it also makes interesting sound effects as well.

This brief video from You Tube gives you a little peek at what Spouting Horn is like.  (Credit to miinaba):

The Hawaiian legend of how Spouting Horn began is interesting.  Here’s how it goes per the Hawaii Visitors and Conventions Bureau’s web site:

Ancient Hawaiians believed this coastline was once guarded by a giant moo (lizard).  Everyone was afraid of the moo because it would eat anyone who tried to fish or swim in the area. One day a man named Liko entered the ocean. The moo went to attack him but Liko quickly swam under the lava shelf and escaped through a small hole to the surface. The large moo followed him and got himself stuck in the lava tube. To this day, you can hear the lizard’s groan and see his breath spraying from the hole.

To find Spouting Horn on a Google Map, click here. It’s easy to find and access.