The old towns such as Fez are notoriously famous for the pickpockets and scammers present in the little cramped streets of the Medinas. If you are traveling solo, chances are you will be approached by more than one store owner to come into their shop for a tea and try to sell you fake merchandise in the name of art.
While you won’t be harmed in a serious way, you can face some serious harassment by hagglers which might ruin the otherwise wonderful trip. How can you stay safe? Simply follow these rules:

Don’t walk in deserted places, especially during nighttime.
Don’t walk alone if you are a woman.
Don’t dress too fashionably. Too much attention is always bad.
Try to avoid wearing or carrying anything flashy or expensive.
…