This is straightforward in daylight but a little alarming in the dark. If coming from the north, go round the starboard mole and go west. (The pilot book says this but it is very counter-intuitive!) You will see the second green light flashing ((2)G7s); head towards it. As you do, you will open up two red lights to port. One is Fl.R5s, and the other Fl(2+1)R12s. Go between these lights to enter the marina. You go down the aisle, leaving the flash new capitanerie building with its wing-shaped concrete roof to starboard, and at the end, do a u-turn round the building and the fuel dock. The quay where most visiting yachts are moored is then to starboard.
It is important to keep well up to the north (Spanish) side of the port as there is a man-made reef of rocks dumped into the harbour on the Moroccan side. This is marked (most of the time) by an east cardinal buoy. A boat did go aground on it the other night, but got off eventually with no serious harm done.
Finally got a picture sorted out to try and give an idea of the harbour.