So you cant be in Fes & don't go there, back there where they manufacture the leather products, the smell stinks back there, so bring a lot of mint with you, its easily to find Tanneries, just follow the signs NOT The Locals! once you are there you will find a lot of guides working there. they will take you to a tour and its not gonna be easy one if you don't have Tic Tac! make sure to agree with them on tour price, don't pay more than 25 DRHs
After the tour they will take you to a shop & trust me don't buy from there unless you are ready for hard barging,
its not easy tour but a lot of amazing captures you can take with your camera there,
P.S wear a running shoes or hiking shoes, Never wear a Flip Flop there!