Katsuura
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See
There's nothing much around here except a small underwater observatory.
Buy
Most mornings (weather permitting) there is a large "morning market" (asa ichi) in the center of the city near the shore. You'll find freshly-caught fish and shellfish, as well as regional specialties and dried snacks - squid, fish, nori, etc. The market is open until about 11:00AM.
Eat
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Drink
Koshigoi sake