Fern Grotto: Wailua River Boat Cruise & Lush Lava Rock Cave
★4.5(862)
You can only reach this fern-draped lava cave by boat, so book a Wailua River cruise early. The acoustics inside are the main draw—expect a live 'Hawaiian Wedding Song' performance that sounds incredible against the stone. Spend about 20 minutes exploring the boardwalks before heading back. Skip the midday heat; the morning tours are way more chill. It is a quick stop, but the views from the boat deck make the $200+ combo tours worth the price.
Address: Wailua River State Park, Kapa'a, Kauai, Hawaii, 96746
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