Gulf Islands National Park sites open ; some are detected on site . Several tar balls were spotted in the area over the weekend . ` State officials have issued an advisory against swimming in the Gulf waters . Miami and Perdido Key , Florida , waters open Monday for swimming and fishing .
Gulf Islands National Park sites open ; some are detected on site . State officials have issued an advisory against swimming in the Gulf waters . Miami and Perdido Key , Florida , waters open Monday for swimming and fishing .