Fort Pickens Campground. From Recreation.gov:
This large campground is open for reservations year-round. It contains 137 family sites with electric and water hookups, as well as 41 non-electric tent sites. A group site with water hookup is also available. Amenities include flush toilets, showers, drinking water and a dump station.
The campground is located on a barrier island between the Gulf of Mexico and Pensacola Bay. Groves of live oak trees are scattered across the island, providing shelter for resident and migrating bird populations, as well as shade for park visitors. The Gulf Islands National Seashore is home to sparkling blue waters, white beaches and coastal marshes. However, more than 80% of the national park is underwater, as it's a vital protective habitat to marine life.