Young kids will like this one,while on a nature walk as them if they would like to build a house for homeless fairies.
Along the way collect leaves, rocks, twigs, feathers, shells. Have a few buttons etc.
Then in the woods or brush near the campsite build the fair house. Tell the children that they need to make pretty and secluded because fairies are shy and like to live in pretty houses.
Then leave the house and during your stay, have your children quietly check to see if a fairy has come.