The lighthouse here, along with another on the east bank of the passage, were built to guide ships through this narrow passage at times of rough seas and turbulent weather; once through though the ships enjoyed the calm of the well protected harbor which even today is one of the most heavily used in Spain.
From the parking lot the camino turns left to return to a trail. Pay close attention to the various forks in the trail; although they are well marked there are many options through the forest.
Along this stretch you will also see markings for the GR-121, a 300km circuit that shares ground with the Camino and on several occasions offers an alternative to the official camino.
You will eventually come to a fork in the trail at a point where indeed the GR-121 turns right where the camino turns left. Both are acceptable, the GR follows the coastline through the forest while the camino joins the paved road. They converge before arriving in San Sebastián.
NOTE: Only the camino path passes the Ulía albergue which is located on the hillside overlooking the city. The trail descends into San Sebastián, and where it meets the Avenida de Navarra the municipal albergue is on your right.