An excellent use of loose parts outdoors, using grass or hay to build a nest, if it was in the fall they could also use leaves. This activity could incorporate storytelling, cooperation, and imagination.
Loose Parts play: Did you know that studies indicate that children actually prefer to play with stones, bricks, stumps, sand and other natural materials, rather than with carefully designed (by adults) playground equipment?
awesome Top 20 of Mud Kitchen Ideas for Kids Mud kitchen (also known as an outdoor kitchen or mud pie kitchen) is one of the best resources in DIY projects for kids to play outside as kids playhouse.