You can take a high-speed boat trip for about an hour to the Dry Tortugas National Park.
VOA : special.2010.03.22
2
Tortugas National park is at the southern most point of the Keys.
VOA : standard.2010.05.26
3
"We think that for the South Florida parks, Dry Tortugas,Big Cypress, Everglades and Biscayne, it is predominately going to be a tar ball event because the oil is weathering."