Cook and drain pasta as directed on package. Rinse with cold water to cool; drain well.
Meanwhile, grate peel from limes; place in small bowl. Squeeze juice from limes; add to peel in bowl. Stir in dressing and taco seasoning mix. Stir avocado into dressing mixture.
In large serving bowl, toss pasta with all remaining ingredients. Pour dressing mixture over salad; toss gently to mix. Cover; refrigerate at least 1 hour before serving to blend flavors.