Berck is a lovely airfield with a small friendly club there.
They are not so particularly used to seeing visitors, and there is nothing at all to do once you have land, except to take-off again. I suppose you could walk into town and to the beach, but it is quite a long way, and the beach at Le Touquet is more extensive.
A long time ago, there used to be a Lockheed Super Constellation parked on the far side of the airfield near the Bagatelle amusement park, but that has gone now.