Where exactly do you plan to be in Morocco? Three days is fairly restricted for planning anything major so may I suggest flying to Marrakech from where you can go up to the Atlas Mountains for part of a day; Ourika Valleys for something different; explore the medina of Marrakech and all its wonders the rest of the time - you will not be disappointed.

For Marrakech. This website offers an excellent selection plus good information. http://www.marrakech.uk.com/#/reviews-2009/4533904236