It's summertime and kids are free from the constraints of school lessons. Maybe their scheduled activities have wound down, too, and you start hearing those words, "I'm bored! There's nothing to do!"
These days children seem to be more scheduled even in their play times than we ever were. I can remember being scooted out of the house and finding ways to use my imagination with the scantiest of props. Kids actually need free play, free time, and room for their imaginations to grow. However, because they are not used to being left to their own devices, they don't have the practice to explore the way you think they should.
This is a collection of suggestions. Your children may not need any prompting from you at all, and for that be grateful! But if they do, you can still just provide them with a little nudge to get them going. What I have gathered here are just a few little nudges that may help.