This is a beautiful area and the most beautiful are not real easy to access. I've seen a very little bit from the Colima side and considerably more from the Jalisco side. Cuzalapa (the coffee town) is part of it as well as the 3-4 little towns on the way to Durazno. There is a road that goes from the Jalisco side over the top and down into Colima but I don't have the car to try it in. The biological station, sponsored by UNAM I think, is accessed further up highway 80.
Did you know? The Biosphere Reserve Sierra de Manantlán is included in the International Network of Biosphere Reserves UNESCO MAB program. It is an important bird conservation site and is one of the priority mountains for Conservation in Mexico.