Hi! And thank you. What was the walk like? Could it be done in one shot? Or could it be broken up over two days?
Like Rainerbernd, I think it would be too much for one day. By my sums, from Vilanova de Arousa to Padrón, it's 35km which could be OK for you. I walked from Cambados to Carril. Then the next day from Carril to Padrón.
Cambados is 4km west of Barrantes OFF the Camino and Carril is 3km north of Vilagarcía ON the Camino. Private accommodation in both.
From Vilanova to Vilagarcía de Arousa you can follow the signs for the Ruta de Padre Sarmiento. It's 10km on quiet roads next to the water and sometimes on small beaches. Carril is another 2km north of Vilagarcía and has a lovely beach.
The only bit of the walk that could be challenging was the 8km or so of road walking from Carril to Catoira. The road (PO-192 via Bamio) goes up and inland. But it's not very steep or twisting like the route out of Combarro. I walked on Sunday so traffic wasn't too busy. It was also at the start of my day (8am-10am) so for me it was fine but doing it in the heat of the day is another story.
At Catoira, you walk along a beautiful paseo fluvial (on boardwalk and shady trails) through the marshland there. Alas, only for 5km or so. There is a bar tucked away (Bar Alba) in Vilar just after this part. You can get a sello here and food/drinks.
Then it's another long hot walk (maybe 7km) on a flat asphalt road - no shade at midday - that runs parallel to the railway line all the way into Pontecesures. Then Padrón is another 3km.
Please note that my measurements are approximate! I used maps.me to find the route but there are a few arrows.
So a lot of road walking and a couple of nice bits near the water.