The first thing that Kino imagines upon finding the pearl is that he will be able to afford a doctor for his son, Coyotito, who was stung by a scorpion.
As the novel progresses, Kino's imagination for what the pearl could offer him and his family grows. He imagines that he and his wife, Juana, could afford a proper wedding ceremony in their local church. He also imagines that their family could buy new, expensive things, like clothing, a harpoon (for fishing), and a hunting rifle.
Kino's biggest dream, however, is that he could use the money he earns from selling the pearl to send his son to school. He imagines buying Coyotito a school uniform and books, and he imagines that his son will have many more opportunities after he is educated.