We are going via the Shuttle in a few weeks time.
We went to Calais a few weeks ago for the first time and went to Cite Europe, which is a big shopping Centre with a Carrefour supermarket. I found the carrefour supermarket too big just to wander around aimlessly (we had our children with us and they were quickly bored). When we go again, I'm going to research beforehand a few types of items i would like to buy eg cold meats, cheeses, breads etc and visit those aisles specifically.
There is also a designer outlet next to Cite Europe, but we didn't go.
We also visited Calais town. It was very quiet and many shops were shut despite it being a Saturday, so we didn't stay long. It may just be that we werent in the right area though. We ended up going to the beach, which the children loved (we planned this).
For our next trip, we are planning on going to Boulogne and see what's around there.
We travelled via the Shuttle. The crossing is about 45 minutes and you go through border controls before you get on the Shuttle, so you drive straight onto the road on the other side. I haven't driven abroad before so I liked the idea that Cite Europe was right next to the terminal. As it was, the driving was fine, so I'm feeling confident with going to Boulogne!!!