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northern Spain and southern France

We are taking our three college aged sons to Spain and France to celebrate our 30th anniversary. One son is studying Spanish in Santander all summer so we will go visit him and branch out from there. Any suggestions you have for outdoor things to do (biking, hiking) as well as historical sites and other ideas for unique things to do would be well appreciated. We have 2 weeks to be there; where should we go and in what order?
Thank you!