Mark,
Go play Le Touquet La Mer (Colt), La Foret (Hutchinson) and Hardelot Les Pins (Simpson).
Stay at Westminster (chique and great food) or Le Manoir (very Brittish with a real pub in the hotel)
Patrice Boissonnas who also posts on this forum can get you set up.
The two other courses I would play in the area are Belle Dune, an interesting French designed dunes course just south of Touquet, and Wimereux (Campbell/Hutchinson) an understated old links course just north of Boulogne.
Granville (Colt) is too far away, and is not as nice as it used to be since the French put a road right through it and the father of DrH redesigned some of the holes to accomodate it. In recent times our fellow GCA'er Stuart Hllett has been renovating the bunkers to sod faced bunkers.