Lagoa Juparanã is the easy natural escape from Linhares. The water body is large by Brazilian lagoon standards, with beaches such as Três Pontas, Caju, and Minotauro giving the city a weekend shore that is freshwater rather than ocean.
Do not expect a manicured resort lake. The appeal is simpler: warm water, boats, low wooded shores, and the feeling of a broad inland sea close to the highway. Go with local advice about current access points, because some beaches and shorelines sit beside private land.