Wailua River is a long, slowly meandering river that starts at the Wai'ale'ale Crater and is fed by several tributaries on the way to the ocean. This is the only navigable river in
all of Hawaii.

For a remarkable Hawaiian adventure, we will cruise up the Wailua River on the most popular river trip to the sacred Fern Grotto, a lava rock grotto covered with tropical ferns. On the way to the Fern Grotto, you will encounter numerous photo opportunities of the tropical grasslands lining the river and Manu Kapu, the Forbidden Mountain, a legendary peak that overlooks the south bank of the Wailua River. The Fern Grotto is located at its base.  The landmark rock marks the north end of the Kalepa
Mountain range.

At the grotto, you will be serenaded by Hawaiian musicians playing traditional, local songs including the Hawaiian Wedding Song as you’ve never heard it before. The acoustics within this natural amphitheater are fantastic and greatly enhance the singing and guitar accompaniment. The trip up this historic and sacred river takes about 40 minutes via a long flat bottom riverboat.