The Saadian kasbah sits on the headland above the town and is partly ruined, partly absorbed into more recent buildings. There is no entry fee, no curator, and no signage of any consequence — you wander among the surviving walls and look down over the lagoon. The remains are modest but the view is excellent and the sense of how the fortress controlled the entrance to the natural harbour is immediately clear from up here.
A separate royal villa built for Mohammed V in the mid-twentieth century stands further along the same headland. It is closed to visitors and not photogenic from the outside; the kasbah itself is the better destination.
The walk up from town is short — fifteen minutes or so — and the headland catches a good breeze on hot afternoons.