JDV, Vleesbaai is a really nice relaxing drive, beach sand from start to finish. Chances of any damage, scratches etc is really less than in town

Take a picnic basket with and if there are kids invloved, let them pack their swimming gear as well. Close to the end of the trail you park on the beach ( legit ) and the kids (big & small ) get a chance to take a swim in the ocean. Here you can also enjoy some snacks etc while watching everybody attempting THAT last dune to go back.
Please, don't be afraid to air the tyres down properly, and have tons o' fun
Drive safely and enjoy
and a Merry Christmas to all