Camping Ur-Onea Bidart & De La Cote Messanges

Hi all I am considering the two sites listed and would be grateful for any comments and/or advice regarding them whether good or bad.  Due to work commitments we will not be in the area until llate July and early August and are aware that it is the Main french Holiday period, so the sites will be very busy as will the roads with this in mind how far can I resonably exect to drive each day, we are driving from Cherbourg  thanks