Been to Cayo Coco, Cayo Guilermo many times. I always pack 20-25 test trilene and lots of leaders. Bring spreaders and good long pliers as everything has teeth!!! Bring lots of hooks and sinkers, silver spinners, white and red plugs. I never pack lures anymore as they take up too much room and I never had good luck with them. At your resort, go to the restaurants and ask for a bag of fresh uncooked shrimp, I usually pay $5. If you are close to the causeway, rent a moped or bike and take a day tour. there are so many different species to catch. the one picture is a snapper my wife caught, a cuda grabbed it and left us just the head! Hope you have a blast!