The Fern Grotto is a geological wonder of Kauaʻi. Ferns grow upside down from the roof of the grotto which was formed millions of years ago. Native Hawaiian plants and colorful exotic tropical plants provide a rain-forest atmosphere.
Take your Hawaiian adventure into your own hands as you travel our rivers with a Kauaʻi river boat tour! Take in up-close and unforgettable views of the Wailua River on one of our River Boat excursions with Hawaii Adventure Center.