"The Tourist Problem" - Riddle?

[MattandCari]

Each inhabitant of a remote village always tells the truth or always lies. A villager will only give a "yes" or "no" response to a question. Suppose you are visiting this area and you come to a fork in the road. One branch leads to the ruins you want to visit the other branch leads deep into the jungle. A villager is standing at the fork in the road. What ONE question can you ask the villager to determine which branch to take?

[Devo]

"which road would you take if you spoke the opposite, in truth or lies?" then go the other way.

see if he tells the truth he would say the jungle because his opposite would lie, and if hes a liar then he would lie and say the jungle too!