It's been a very long time since I've been there, but both Guaymas and Bahia San Carlos offer some good landscape photographic opportunities. Although the area is now built up, there are still very good views of arcing shorelines and aquamarine water. It is also the first place in Mexico, as one heads south where coconut palms can be found near the beach - good for tropical vistas. I think the rain season may have started which means there may be some god cumulous cloud formations in the sky instead of blazing sun. It will be hot.
Watch it in Sinaloa, there's some nasty drug-related stuff going on there. The train ride over The Sierra Madre Occidental is nothing short of spectacular. Again, good time of the year to be going, the yellow-brown vegetation will be replaced by green, and some good cloud formations building on the mountains. Maybe some water cascading down the canyons if there has been some heavy rain. I'd take a polarizer. At Divisdero and Creel there may be some good ethnographic shots of Tarahumara people. Be discreet in photography. In 35 mm terms, I'd use 135-200 mm for people.
I'm 35 mm - if I were going, I'd definitely take the tripod, for medium formt a must.
Hope this helps.
Gene, on the Border in Brownsville, Texas