Entrance fees are required and collected at the following areas of Gulf Islands National Seashore: Fort Pickens Area, Opal Beach at the Santa Rosa Area, Okaloosa Area, Fort Barrancas Area, and Perdido Key Area. All Interagency America the Beautiful passes are accepted for entry into these areas. One hundred percent of the fees collected at national parks are used by the National Park Service for the improvement and maintenance of park facilities and programming. Eighty percent of the fees collected here are used to replace and improve facilities throughout this park. Free Entrance Days in your national parks.