In a large zip bag, combine the pineapple juice, lemon juice and salmon fillets; seal and marinate in the refrigerator for 30 minutes to 1 hour, turning occasionally.
Preheat the oven to 400°F. Spray a 11x7-inch dish with nonstick spray.
Remove the fish from the bag and drizzle a small amount of the marinade onto the bottom of the prepared pan, discarding the rest. Combine the sugar and next 5 ingredients (sugar through cinnamon) in a bowl. Rub over the fish; place in the baking dish.
Bake for 10 to 12 minutes or until the fish flakes easily when tested with a fork. (Timing will depend on the thickness of your salmon). Serve with lemon slices, if desired.