They do still play. I, for instance, was a dog half my childhood. My cousins, who are between six and fourteen, do all sorts of different things: They draw and paint. They play with cuddly toys, plastic animals, dolls, trains, leaves, mud, water and sand, as well as each other. They also build robots and doll houses out of cardboard. Give them a cardboard box, and they play boat or house. Give them blankets, they will build a cave or play dress up. On occasion, they wrestle.
In your scenario, I would prepare some crafts, but it is possible the kids are much better off amusing themselves. They might just want to relax, or they may want to play. If you do need to entertain them, you could:
* read to them
* put on an audio book (have them draw what they are hearing if they want to)
* put on music, let them dance
* make masks out of paper plates
* let them draw
* let them have some fun with play-dough
Just off the top of my head…