Cerro Musun Natural Reserve
Cerro Musun Natural Reserve is located in Matagalpa Department and is about a 3 hour drive from the city of Managua near the city of Rio Blanco. From the city of Rio Blanco, go north about a half mile to the trail guide managed by FUNDENIC (La Fundacion Nicaraguense Para El Desarrollo Sostenible). There you can hire a trail guide for the day for a reasonable price.
The natural reserve has various nature trails as well as campgrounds (Zona de camping Salto de los Valles). The reserve is quite untouched and doesn't have a large number of visitors.