This is the entrance to Fort Caroline at the Fort Caroline National Memorial along the south bank of the St. Johns River near Jacksonville, FL. The park includes trails, a reconstructed fort, memorial to the first French explores and is adjacent to Timucuan another NPS site. This fort has a short dark history - https://en.wikipedia.org/wiki/Fort_Caroline
In the brief span of four years, 1564 to 1568 the fort was destroyed and rebuilt and was the site of two massacres one by the Spanish and one by the French.
The park personnel are working on a dugout canoe. That is the bake over right past the canoe.