Fodor's Expert Review Fern Grotto
The Fern Grotto has a long history on Kauai, and though it's really not much to look at, visitors seem to like it. Perhaps it's the serenity of just cruising up and down the river accompanied by Hawaiian music. The grotto itself is nothing more than a yawning lava tube swathed in lush fishtail ferns 3 miles up the Wailua River. Though it was significantly damaged after Hurricane Iniki in 1992 and again after heavy rains in 2006, the greenery has completely recovered. The Smith's Kauai tour group (www.smithskauai.com)is the only way to legally see the grotto. You can access the entrance with a kayak, but if boats are there, you may not be allowed to land.