I invited some of my nieces (and a nephew) for a sleepover over the weekend. It has been a long time since we has some time together doing stuffs. I set up a treasure hunt game - they have always loved treasure hunts as children - 10 years later, they are still running a round looking for clues around the house : screaming again!
I borrowed a template from the family fun website and set up riddles and clues. It was rather fun seeing them having a ball of time. They took but 15 minutes to complete the "hunt" and the winners were rewarded for finding the treasure before the other group.