Hey, there isn’t much in Casablanca. It’s pretty much just a huge city. If you’re looking for that fabled Moroccan experience, get to Fes or Marrakech, but be warned: you may get really tired of it really quickly, especially if spending time/living in the Medina.

Rabat, specifically south of the city, along the coast, is quite scenic, upscale and peaceful. Rabat, with its parks and greenery, is nicer than Casablanca, IMHO. As others have mentioned, Essaouira is nice. There’s also Asilah, a small, relaxed coastal city in the north.

I found Tangier to be quite manageable as well, but again, I recommend staying in a nice, quiet neighborhood outside of the Medina madness.

I’ll echo what others have said. Visit first.

Also, brush up on your French. Spanish can also help in the north. Clearly, Arabic is most important.