Klakski
Don’t forget to include the German cemetary in La Cambe nearby. It’s about a 20 minute drive from st-Mere-Eglise.There’s so much to see and do, he’ll love it. Don’t miss the D-Day Experience at Dead Man’s Corner near Caretan. They have a museum, 3D Imax cinema, and flight simulator. Sainte-Mere-Eglise and the American Cemetery near Omaha Beach also in the same area. (Shameless plug - Aces High in Sainte-Mere-Eglise is the business my wife works for. Good range of artworks and souvenirs)
Nearer to Gold Beach is Pegasus Bridge - also not to be missed. Good museum and the famous Cafe Gondre the first building to be liberated on D-Day.
Have fun.
Bajeux is a nice market town to visit, especially the tapestry. The camp site, municipal, there is good to.