Spouting Horn Beach Park is located on Lawa'i Road in Po'ipu in south Kauai. The ocean attraction can be viewed from the top of a small hill with a guard-rail. This is a popular spot for tour buses, so expect to share some space at the rail. Like other blowholes, Spouting Horn is caused by a hole in a lava shelf. The ocean rushes under the shelf and up through the hole with a mighty force that sends water shooting into the air. What makes this blowhole slightly different is the addition of a second hole that only emits wind and creates a great moaning sound.
Spouting Horn puts on quite a show at high tide but is equally entertaining most of the time. It is possible, although not encouraged, to go beyond the guard-rail and explore the lava bench. This activity is done at your own risk as some unfortunate souls have been injured or killed when a large wave sucked them into the blowhole. There are rest rooms in the park. It seems that this area is also popular with local merchants who will set up booths of souvenirs. If you have some time, be sure to take a second to peruse your way through their booths. You might just find a treasure worth taking home. Take Highway 50 from Hanapepe toward Lawa'i. Just past Mile Marker #11 turn right on Koloa Road (Highway 530). Continue to Po'ipu Road and turn right again. The road forks near the ocean, go right on Lawa'i Road. Spouting Horn is approximately one mile down the road on the left. Park and walk down to the overlook.