PLACE shrimp in large saucepan. Cover shrimp with water. Bring to a boil; reduce heat to low. Cook for 3 minutes or until shrimp turn pink. Place shrimp in ice water to chill.
DRAIN shrimp and cut into 1/4-inch pieces. Place shrimp and 2 cups lime juice in medium glass bowl; mix well. Cover; refrigerate for 24 hours. Drain shrimp; place in large serving bowl. Add remaining 1/4 cup lime juice, olives, tomatoes, onion, cilantro, seasoning sauce, oil and jalapeños; mix well. Refrigerate for 2 hours. Serve with chopped avocado, if desired.