Vieques environmentalists say a government-planned recreational area on the small island's south coast threatens the heart of a unique and fragile ecosystem and a rare bioluminescent bay. But while activists voice their concerns about potential environmental danger there, the Puerto Rican government, it seems, is listening. The Puerto Rico National Parks Department aims to develop a "vacation center" targeted at middle-class families at the Sun Bay public beach. The plan consists of a two-part process, according to National Parks Executive Director Ramon Nieves. First, the existing public beach facilities, about a half mile east of Esperanza, will be renovated, and...