Combine all ingredients for Sake marinate in a bowl or food storge bag, add shrimp and put in Refrigerator for up to 3 hours.
Shortly before bringing shrimp out of the marinade, skewer all onions, peppers and pineapple, spray with non-stick spray liberally and season with garlic powder, salt and pepper. Set aside.
Preheat outdoor grill. While grill preheats, skewer shrimp.
Spray grill with nonstick spray. Start cooking vegetable skewers 5-6 minutes before shrimp skewers. Shrimp will take less cooking time.