Simplify the following text for a Grade 11 native English-speaking person.
Original: Off the north coast of the province , some ( cays ) of the Jardines del Rey archipelago are being developed as tourist resorts , principally Cayo Coco and Cayo Guillermo .
Simplified: Off the north coast of the province are a string of cayos ( cays ) - these islands are being developed as tourist resorts , principally Cayo Coco and Cayo Guillermo .