This was the Woodland Trust's promotional material this year. It gave things to do for various ages of children. And for those aged 3-5 the thing to do is to go barefoot! I was thrilled to see this. Well done them. Of course it's also the best thing to do for older children too and you can do all the other activities while shoeless, but nonetheless it's a very promising start. Also, considering this is about things to do while away from home, the suggestion to play around in mud in a woodland is really rather exotic and brave.