i have been to casablanca about 15 times on business in the last three years, and i really don't recommend it to anyone.
morocco is a tourist friendly destination, due to simple economics. they have no oil or gas like algeria, and other than agriculture, the is little other major industries.
driving in the country is fine, as the volume of traffic on the roads is low, outside the cities that is.
seriously, to go for a day trip, would in my mind be a waste of a day.. to go for a week with a car and head of at random is much more like it.