Cook the pasta according to package instructions until al dente, drain and rinse with cold water.
In a large mixing bowl, combine mayonnaise, apple cider vinegar, and sugar; whisk until smooth.
Add the cooled pasta to the dressing and toss to coat evenly.
Fold in the cherry tomatoes, cucumber, red onion, bell pepper, black olives, and chicken, if using.
Season the salad with salt and pepper to taste, adjusting as necessary.
Cover the salad and refrigerate for at least 1 hour to allow flavors to meld.
Serve chilled or at room temperature, garnished with additional herbs or veggies if desired.