Parque Provincial Aconcagua
Fodor's choice
Extending 66,733 hectares (164,900 acres) over wild, high country, this provincial park has few trails other than those used by expeditions ascending the impressive Cerro Aconcagua (Aconcagua Mountain). You can get multiday permits for climbing it either through your tour operator or on your own at the Mendoza Tourist Board Visitor's Center in Parque San Martín; it's open weekdays 8–6 and weekends 9–1. Day permits (to visit as a tourist, not trekker) are only available online.
