How long are you staying and what riad? We went there last February for a week. Ourika valley was nice with a really gool guided hike and essaouira worth a visit. The drive across the Atlas is spectacular but if you head that way it would be worth staying in the desert for a night or two as the journey is a bit of a slog.
Eat lots of street food, visit the old palace in the south, there’s a beer dungeon in the supermarket just south west outside of the old town. And if you’re buying anything look to pay a quarter of whatever they’re asking.