Make some dinosaur bones using salt dough and when they have hardened, bury them ready to dig up like Paleontologists. You could add sounds or numbers to your bones to practise number or sound recognition and to take this one step further, order the numbers or make words out of the sounds!
Salt Dough recipe
2 cups of flour
1 cup of salt
1 cup of water
You can either bake the bones, or leave them to dry out and harden naturally (this will take longer than baking the salt dough)