A growing number of Blue Flag-certified sites are transforming the country’s coastline.The scenic Praia do Tombo beach in Guaruja, Brazil.Credit: Vinicius Bacarin/Adobe StockWhen people think of South American beaches, the iconic shores of Copacabana and Ipanema in Brazil likely come to mind first. But the country has more than 2,000 beaches stretching along nearly 5,000 miles of Atlantic coastline, including a growing number that are being mana…