What can I do in Morocco in 3 weeks?

Three weeks is a privilege most travellers never get, and the biggest mistake I see with it is treating it as a 15-day trip with six more cities bolted on. It isn't. Twenty-one days is permission to slow down to the rhythm of the country — to spend three nights somewhere a guidebook gives an afternoon, to take a cooking class and an unplanned market day, to let a place change your plans. Live it; don't conquer it.

A spine I trust: open with the full grand circuit — Marrakech, the Sahara via the valleys, Fes, Chefchaouen and the north — at a genuinely relaxed pace, which alone fills twelve to fourteen days. That leaves a full week, and here's where three weeks earns its keep: you can finally add a region the shorter trips can't touch without wrecking the whole thing.

My favourite uses of that extra week: head into the deep south for the Draa Valley's palm oases, Agadir's beaches and the Anti-Atlas; or trek in the High Atlas, two or three days walking Berber villages up toward Toubkal with mule support and mountain gîtes; or simply plant yourself on the coast — Essaouira, Taghazout, the surf and the slow afternoons — and not move for five days. Any of these turns a tour into a relationship with the place.

The honest counsel for three weeks is restraint, which sounds backwards. The temptation is to use the time to see literally everything, and you'll end up exhausted and remembering none of it. I'd build in at least five days across the trip with nothing scheduled, cluster your driving so you're not in the car daily, and accept that even three weeks won't show you all of Morocco — and that's fine. The goal at this length is depth and rest, not a complete map.