- Kauai's eastern side is home to many natural attractions, not the least of which is this enormous lava cave wreathed in ferns. You will need to take a river tour in order to catch a glimpse of it. If you want to make a day trip out of it, take one of the more rugged kayak tours. These include a few other stops past the grotto. Speedboat tours are faster and also include entertainment and refreshments.
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