Answer:
I am a good state, there can be no doubt of itΝΎ But those who are in, entirely are out of it.
I am so simple that I can only point. Yet I guide men all over the world.
What binds two people yet touches only one?
I sleep by day, I fly by night. I have no feathers to aid my flight.
It floats over the land, It cuts the tallest mountain, Its voice is like a fountain, Its body like a snake, Will flow into a lake.
People take me on walks and I run and have fun. What am I?