The Stadhuismuseum occupies Zierikzee's old town hall, a handsome building with a slender tower and Neptune looking out over a town that made its money from the sea. The setting is half the reason to go; it feels properly civic, not like a collection dropped into a neutral box.
Inside, the museum covers the history of Schouwen-Duiveland, maritime trade, civic life, and the objects that survived Zierikzee's long decline from important port to quiet provincial town. It is the right indoor stop if the weather turns, and a useful way to make sense of the monuments outside.