At the exit of Porto Torres, follow the indications "Sassari - Nuoro - Cagliari for about 80 km till the exit "Nuoro".Then follow indications to Nuoro (SS129) for about 25 km till the detour Nuoro-Olbia 4 corsie. You will enter on the motorway again, go towards Olbia till the exit Dorgali
In Dorgali keep indications Calagonone, and then the road signs "Hotel L'Oasi" (be carefull if you use a gps, in the middle of the ring road it makes you turn left, but you must go straight on for about 3 km till a tunnel on the left