Not quite on the camino, but not quite off it either.
The town of La Isla sits to the north of the N-632, and the camino does not technically pass through town.
From the albergue in La Isla it is possible to get to Colunga via a coastal path that takes you through Güerres. Inquire at the albergue for more information.
At the start of La Isla, which itself sits at the edge of the camino, the camino turns left off the N-632 to follow a quiet road through a number of small hamlets. It rejoins the N-632 at the entrance to Colunga.