Driving in Morocco

It's probably better to visit Morocco for a few weeks, not just a week - it's a big country for somewhere that looks small on the map. Or return there, having visited on a previous occasion.
I hear public transport is good although we travelled by car. If you are going to drive you have to be a confident driver like my brother. I was very impressed by his ability to slip into driving like a Moroccon - much better than a Moroccon actually but that's because he isn't a completely anarchic driver. I am a pretty confident driver over here but I don't think I'd enjoy driving in Morocco. I certainly don't recommend collecting your car from the airport to drive to an unknown location in the middle of the Medina (in the middle of the Marrakesh) in the rush hour.
PLAN YOUR ROUTE: We didn't really check the map properly, neither of us was exactly certain of the location.
DON'T RELY ON THE ACCURACY OF SPELLINGS: I knew we had to get to the Place Mokef (the welcome email from the Riad said "Mokef") but on the map it's shown as Place Moukef so we were constantly uncertain as to whether we were going to the right place.
GETTING TO MARRAKESH MEDINA FROM THE AIRPORT (as I remember....) Turn left out of the aiport - remember Moroccons drive on the right. Follow the signs to Centre Ville (Moroccons speak Arabic and French). So...take the second right but then you also need to work out which side of the Medina you are travelling to (East, West, North, South) as you'll be driving around the walls of the Medina to find a gate that takes you towards the place you want to be.
STATE OF THE ROADS
Even a road which looks like it's a main road may be rutted/gritty/full of potholes and people.
TRUST YOUR RIAD
If they say they'll come to meet you, it's very likely they will.
BE PREPARED TO USE A TELEPHONE
There are teleboutiques everywhere with public payphones and someone who will provide change. Don't be scared to go in and ask for help.
PEOPLE OFFERING HELP MAY BE LOOKING TO MAKE SOME EASY MONEY
If you've arrived at the right place and have spoken to the people at the riad and someone has said they're on their way to meet you, they probably are, so there's also no need to accept help when it's offered.
RULES OF THE ROAD - with pushbikes everywhere, and no helmets on motorbike riders (nor lights on motorbikes), plus babies on motorbikes, trucks, buses, and donkeys, camels, horses, dogs, cats, children, many people blind or with difficulty walking:
Be assertive
Conform to anarchy - everyone expects you to miss them
Be aware of uneven road surfaces
Lots of diversions - not clearly marked
Drivers hoot to warn when they are overtaking but you can be fined for using your horn too much in town
Wear your seat belt or be fined
The road signs are similar to those in the UK
You often have to pay for parking but can't rely on the care of the attendant - one of our wheel trims went missing in Essaouria!
It's not far to the mountains from Marrakesh
If you can, have a car with air conditioning - a pleasant luxury although obviously you can end up using more fuel.