Pirates Past Noon by Mary Pope Osborne

Jack and Annie arrive on a sandy beach and soon realize they’ve landed in the world of pirates. They’re captured by a gruff crew searching for buried treasure and must use their wits to avoid walking the plank. When a hidden map and some quick thinking save the day, the children escape with new knowledge and a deeper understanding of bravery. This swashbuckling tale is filled with tropical danger and treasure-hunting excitement.