The shrimp, themselves, are a tiny bit spicy because of the cayenne pepper, and the pineapple jalapeño salsa is “medium spicy.” If you want to reduce the spiciness, you can simply leave out the cayenne pepper all together, and use just ½ jalapeño (or no jalapeño at all). If you wanted to make them spicier, I wouldn’t add more cayenne as they’ll just taste over-spiced. I would just add a tasty hot sauce and you could always use more jalapeño in the salsa.