ow for the first leg, in the Dry Tortugas, west of the Florida Keys. This gorgeous collection of coral reefs and uninhabited islands was fortunate enough to miss the biggest impacts from the spill, but it's right next door to the Gulf. "Dispersed oil doesn't mean the oil is gone," says John Hocevar, Greenpeace's oceans campaigner. The summer of the spill may be winding down, but this battle isn't over.</p><p> <span class='see'><a href='http://www.time.com/time/picturesoftheweek' target='_blank'>See TIME's P