The Westin St. Francis San Francisco on Union Square is a landmark hotel in the heart of the city. It features a wellness center that offers a range of services to promote relaxation and well-being. Guests can enjoy spa treatments, including massages, facials, and body wraps. The center also includes a fitness center with state-of-the-art equipment and a swimming pool. With its prime location and luxurious accommodations, The Westin St. Francis is an excellent choice for a wellness retreat in San Francisco.