The French fort, Fort St Louis, has a commanding view of Marigot harbor and is well worth the short walk up the hill. The photo is from Glenn Aker.
Fort Amsterdam
Fort Amsterdam also has a commanding view of the harbor, but this harbor is Philipsburg, the Dutch capital. Peter Stuyvesant, the peg-legged governor of New Amsterdam when the British took it from the Dutch and renamed it New York, was the governor here. His leg is still someplace near these ruins. Generally, the guns are not used to fire on cruise ships.