2956 Kress St., Lihue
This old-school ramen shop has been a Kauai stand-by for 70-odd years and counting (they're also known for lilikoi pie). There's typically a long line of locals, and it is completely frill-free, but it's a great post-airport choice after a long ride (or in advance of a red eye back to the states). By Hawaii standards, they're also open quite late.
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