Ixtapa heading north
If you are still in BAja then I assume you will be taking the ferry to Mazatlan and then down the coast to Ixtapa/Zihuatanejo .Great route!
If you want to head north from Zihuatanejo you have a choice of going back west up the coast on Mex 200 to Lazaro Cardenas/la Mira and taking Mex 37 north to Uruapan and into the Bajio with its multitude of route choices north to Zacatecas.Mex 37 is a great route into the temperate highland interior.
A second choice , and longer would be to go 15km north of Ixtapa on Mex 200 then turn inland on Mex 134 which goes northeast to Cd.Altamirano , then take Mex51 nort to Zitacuaro on Mex 15 ,in the south edge of the Bajio , then go west to
Morelia , North to Irapuato,Leon, Aguascalientes to Zacatecas .
From ZAC/ZAC you can either take Mex 45 north to Durango,DGO and Hidalgo del Parral or Mex49 north past Torreon/Gomez Palacio to Jimenez and from there west to Hgo.del Parral . From there it is a question of taking Mex 24 west to the turnoff north onto Mex23 to Balleza ,Guachochi and you are IN the Copper Canyon country , then north to Creel .
All these roads are wonderful for the most part, been there done them.
As it is now past mid October be ready for some brisk to downright cold weather in the northern high country. It does snow there during winter, you know. The high country in the west of Chihuahua and Sonora and Durango can get severe snow dumps from late November into March .If you wind up in te region during that period be ready to hasten to lower ground if the weather systems move in offf the North Pacific