Does anyone have information about a private one day tour of Tangier?
I had looked into doing this in 2017. I decided that it was not worth the time and expense. Based on my research, you are getting a tacky, Juarez/Tijuana version of Morocco.
Sorry to be a Debbie Downer.
You may want to use the Search function at the top of this page to see what others here have said about a day trip to Tangiers.