If you have more time, you can include a visit to other famous landmarks such as the Gran Via, the Royal Theatre, and Plaza Mayor. For food lovers, a visit to the popular Chocolateria San Gines is a must-do, where you can indulge in churros and hot chocolate. If you have less time, you can skip the Retiro Park and Puerta del Sol and enjoy a longer stay at either the Royal Palace or the Prado Museum.