Nice area, the Michelin map rightly has the coastal road as a scenic route. Mirleft to the north has an interesting ex-Spanish fortress which is now an upmarket auberge (Les Trois Chameaux). I stayed in the prison block I think.
Between Mirfelt and Sidi Ifni is Legzira Beach which is very pretty with a couple of sea arches, cheapish hotels and a camp site.
To the south is Bou Jerif with two Foreign Legion forts, one a total ruin and interesting to view, the other a hotel/campsite called, not surprisingly, Fort Bou-Jerif.
Tim