The Bucket o'Blood Sea Food Grotto is an inn.
The roomy building of the Bucket o'Blood Sea Food Grotto was apparently once owned by the pirate Henry Morgan, who hid the map to his treasure behind the fifth brick on the right-hand side of the fireplace. By 1942, when Yellow Beaks arrived seeking the map (whose location he had obtained from an old sailor who'd, for his part, learned it from the ghost of Morgan himself), the building was operated as an pirate-themed inn and restaurant by Donald Duck and his nephews, an occupation they presumably abandoned after they found the treasure with Yellow Beak.
Behind the scenes
The Bucket o'Blood Sea Food Grotto is the first location in the 1942 story Donald Duck Finds Pirate Gold!.