Camino de Santiago and/or other long hikes--anyone with experience?

We are planning a trip to Europe and have at least one family member who has expressed an interest in hiking Camino de Santiago. Anyone have any experience or knowledge? He’s pretty fit and has traveled quite a bit over the years.

In the absolutely everything has been discussed here before…

http://talk.collegeconfidential.com/parent-cafe/2157667-el-camino-de-santiago-anyone-done-it.html