FORT MYERS, Fla. — Brown water from Lake Okeechobee hasn’t prevented tourists from flocking to Lee County for vacation. Five million tourists visited Fort Myers in 2015, generating revenue of about $3 billion, according to the Lee County Visitor and Convention Bureau. Both figures are five-year highs. Now, the bureau is expanding its marketing strategy with its “Islandology” campaign. Brian Ososky, the marketing director of the bureau, said the concept focuses on genuine experiences in a natural destination. “We know they want real authentic experiences when they visit different places,” Ososky said. “We can get that message across that Lee county offers them just that — an authentic real experience.” The $9 million-dollar campaign has already advertised Lee County to top markets in the Northeast, the Midwest and overseas.