FINDING PATH ON A TOPOGRAPHY

Hi, im working with a  topography in a mesh, i have a surface that gets close to it, but the mesh is the most accurate.

I  want to find the most confortable paths from point A lets say on top of it to point B on the lower point of it. I  was trying some solutions that  i found in this blog but no one seems to work.

i attached a picture of the problem, and an example of a solution (paths in blue)

thanks a lot!

melanie