Wailua River State Park
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Wailua River State Park

Take a riverboat up the Wailua—which translates as the "river of the great sacred spirit"—fed by Mount Waialeale, one of the wettest spots on the planet. Seven temples once stood along Hawaii's longest and only navigable freshwater passage. Today, the remains of four are still visible, alongside petroglyphs and rocks where the island's alii (royalty) would give birth. Stretch your legs at the Fern Grotto: Verdant plants blanket the roof of the volcanic-rock cave there.

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Original mauna kea beach hotel