Hide messages in a pot, under a bench ...
• You need papers, pencils and a big bag of candy.
• Number 6 to 8 places-steps that your swarm of children will elude in concert.
• Start with a big tree in the yard, then the terrace, the mailbox, only obvious places.
• Hide messages in a pot, under a bench ... Each contains a word, a photo, a rebus, which refers to the next step, to the treasure: sweets.