The Eerste Friese Schaatsmuseum is exactly the kind of specialist museum that makes sense in Hindeloopen. Friesland lives with skating history, and the displays cover old skates, winter races, and the near-mythic Elfstedentocht, the eleven-cities tour that only happens when the ice is strong enough.
Even if you are not a skating obsessive, the museum gives useful context for the frozen-canal imagination of this part of the Netherlands. It is compact, personal, and best treated as part of a slow wander through Hindeloopen rather than as a standalone day trip.