At 10.5 miles, we have Pasai Donibane, where there seem to be a lot of cafes near to the route to eat, example below

The accommodation is an hour’s walk from the Camino route which takes us along the beach.  We do not want to be walking an hour at the end of the day and an hour at the start of the next day to get back onto the route.

I imagine that there will be a strong show of hands to go swimming when we arrive in San Sebastian.  A strong option is to have a swim, eat in San Sebastian, get a taxi back to the accommodation and then get a taxi back to the beach on the morning.  If there is public transport to the hotel, then fine, but walking is not an option.  

The choice of food in San Sebastian is huge and there are plenty of laces to eat by the beach before we get the taxi back to barracks