Des Réservations Faciles, Rapides, Sécurisées et Sans Frais, et un Tarif Garanti. Please note that Wyndham Grand Istanbul Kalamis Marina Hotel's outdoor pools will be closed during winter season. On Wednesdays from 17:00 until 19:00 and Saturdays from 11:00 until 13:00, children between 3 and 6 years old can use the swimming pool accompanied by their parents or under the guidance of our instructors provided that they wear a swimsuit.