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Photo: Valdiney Pimenta, CC BY 2.0 via Wikimedia Commons
A big cave (100 m deep) with a lake at the bottom of an incredible blue colour. Approximately 20 km from the city.
Gruta do Lago Azul Natural Monument is a natural monument in Bonito, Mato Grosso do Sul, Brazil. It holds two caves with interesting but fragile calcareous formations, and has been listed as a protected area since 1978.
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Rent bikes in the town center and go with the locals to sunbathe, play volleyball and swim in a river with a lot of fish.