Here, in part, is what itv.com says about the series:
As their journeys unfold taking in the stunning French countryside, winding around breath-taking mountains and cruising along the coastal roads the couples are tasked with collecting a total of three items that best represent the head, heart and stomach of each of the regions they are passing through.
The intrepid explorers are followed as they each find their own route through France and at the
end of each stage of their journey they are judged on what they have learned and collected along the way. The overall winners are revealed in the stunning setting of Monte Carlo in Monaco.