This is the Fort Clinch State Park in Fernandina Beach. It is a really nice beach front campground but there is also another campground here that is on the river side of the Fort that is shady and a little more rustic. We stayed on the beach side campground and really like it there. It is an short walk to the beach over a boardwalk. We did walk two miles one way to the fort and two miles back in a misty rain. We will go back here in the future.
Here are a few pictures of our camping spot 18, the Fort and the beach.