Free things to do this Christmas in London 2012 You don't have to spend a single penny to get into the family-festive spirit this Christmas. Take advantage of the free museum activities, or have some fun at Hyde Park's Winter Wonderland.  It costs nothing to see toys being demonstrated in Hamleys or Harrods - and if you make sandwiches and bring a thermos of hot chocolate you can enjoy London's Christmas lights in almost every street.