The largest mosque of Morocco is open to non-muslims and this is simply an oppurtunity that you have to take. It truly is one of the most beautifull mosques in the world. It is right there in the list with the Blue Mosque in Istanbul and the Sheikh Zayed Mosque. Get a guided tour inside starting at 9am, 10am, 11am and 2 pm. From port it is 4,5 km / 50 min walk to the west.
Hassan II Mosque, Casablanca