You should add cranberry's to the crop package they grow and are native to that area. They will have to make paddies for the rice so man made cranberry bogs are not that big of a jump they were cultivated by the native groups of New England in our timeline. And they would have a big affect on native society they can be used to make red dye sauce's for food and potently a form of wine. Those goods could be traded with the Central American cultures. Theirs so much you can do with those berry's if you add them.