One of several rooms all gussied up for visitors. From the nearby plaque:

OFFICERS' QUARTERS
These rooms were assigned to officers, who sometimes brought their wives and families to live with them. Officers were given rooms based on their rank. The commandant and other high-ranking officers on Pea Patch Island lived in houses outside the fort. A three-room suite, consisting of two bedrooms and a parlor, would have gone to a lieutenant colonel or a major. Other rooms were set up for officers who were just passing through for a few days.