What resolution is your landscape at? Check in Modes > Landscape > Manage and check Section Size, Sections per Component, and Number of Components. Overall Resolution is the total number of polys that the landscape is made of. Possibly try increasing these? If you don’t have a large enough resolution the landscape will seem blocky when sculpted, especially if your making a high peak mountain top…
Also the landscape tool isn’t really designed to sculpt craggy mountain peaks, as you say you will end up getting a lot of stretching in the mesh and textures if you try to push it too far. You will find for cliffs that are steep and jagged and big rock pillars, people will usually use/augment the landscape mesh with separate cliff and rockface meshes.
For the paths maybe try using the ramp tool (along with the increased resolution landscape)…