Easy:
  - Distance/day < 13 km
  - Walking < 6 hrs
  - Elevation: ± 800 m
Medium:
  - Distance/day < 18 km
  - Walking < 8 hrs
  - Elevation: ± 1100 m
Advanced:
  - Distance/day < 25 km
  - Walking < 10 hrs
  - Elevation: ± 1500 m