Am booking a day trip for August, going via Le Shuttle to Calais then down to Boulogne.
Will probably get Le Shuttle around 8am (so getting to Boulogne about 10/10.30 local time). Plan to mooch around the market and old town, have a picnic, then maybe Nausicaa in the afternoon and of course stopping at a hypermarche :)
Can't decide what time to get the train back - thinking about getting the train back about 7.30pm (so leaving Boulogne at 6.30) - does that sound like a reasonable length of time to fit everything in?