Advice Last-Minute Morocco Trip Advice Needed

My wife and I just decided on a very last-minute trip to Morocco (and Belgium) from CDG. We're flying into Morocco first and are a bit overwhelmed with planning such a spontaneous trip. We're looking for advice on must-visit places, local customs we should be aware of, and any tips for navigating the country on short notice. Also, if anyone has experience with combining Morocco and Belgium in one trip, we'd love to hear how you managed your time and any recommendations you might have. Any help would be greatly appreciated!