**Ask the locals!**

Something missing from the current answers, and the first port of call in my opinion, unless you are somewhere very remote. 

For any mountain with significant difficulties or dangers I would always try to ask a local or two (especially in countries where the mapping is poor). Some suggestions:

 - The park rangers
 - The local guides (they are often happy to give general advice for free)
 - Hut guardians
 - Farmers, shepherds and hunters
 - The local climbing or walking club
 - Even the local tourist office will sometimes have a route map.

While you are at it, ask about any local hazards: afternoon thunderstorms, flash floods, wild animals and the like.

If you ask someone who doesn't know, they will often pass you on to someone who does. I've had a lot of luck with this approach over the years.