Child friendly sites in the Basque region

Hello,

Next summer, my husband and I are taking our 2 boys (9 and 11) to the Basque region of Spain. Having endured disco noise every night from campsites in France last year, we are looking for a quiet site. We would also like a pool, preferably with a water slide for our youngest. If we can't get the waterslide near a beach location we would happily do a beach week and then a pyrenean week.

Loook foward to your thoughts - Lindsay