Though St John's Hospital might be what brings you to town, perhaps you'll have a chance to explore more of Bruges while you are here.
Gruuthuse Museum is just one of the attractions in Historical Center Bruges, Bruges so you might want to stop by during your trip. If you want to experience more of the culture Bruges has to offer, head to Church of Our Lady, Groeningemuseum, and St. Jans Hospitaal - Hans Memling Museum.