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San Juan Categories
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$500+
Known for its soaring interiors, million-year-old stalactites and stalagmites, and namesake underground river, Rio Camuy Cave Park (Parque Nacional de las Cavernas del Río Camuy) in Puerto Rico attracts nature lovers and casual visitors alike. The 268-acre (108-hectare) complex is most famous for its cave tour, but it also offers picnic pavilions, walking trails, and a playground.