When you arrive at TARBES or PAU, take direction LOURDES, then ARGELES-GAZOST
Or by 2X2 channels (faster and shorter). You go to the end of it. You arrive directly at the stadium of Argelès-Gazost. Then follow direction HAUTACAM.
You still have exactly 7 Km to go
There you cross the Gave de Pau, (always direction Hautacam). You cross the villages of AYROS-ARBOUIX and you arrive at SOUIN.
Here is the big white house with a gray terrace
and the entrance is on the main road (100 m after the donkey)