Mboi Kae Beach is one of Encarnacion's river beaches along the broad waterfront created by the Paraná. It is generally a calmer alternative to the better-known Playa San José, with sand, warm-weather swimming, and room to sit out near the water.
The beach is most appealing in summer, when Encarnacion behaves like Paraguay's inland resort town. Facilities and water conditions can change, so check locally before swimming and treat it as part of a Costanera afternoon rather than a stand-alone beach holiday.