Cook the pasta in a large pot of salted water to al dente, then drain. Rinse with cold water, put noodles in a large bowl, then stick it in the refrigerator.
Cut the bacon into bite size pieces and cook in a large skillet until crisp. Drain on paper towels.
Take noodles out of the refrigerator and add the Italian dressing, bacon, tomatoes, onions, olives and Parmesan. Stick in the Refrigerator until ready to serve. Add the lettuce right before serving. For a stronger taste, let it sit overnight.