Planning A Scavenger Hunt

I am planning a 12th birthday party for my son. How do we begin planning a scavenger hunt.? It will be in the neighbourhood

Thank you
Diane

Have the group split up in groups. Have ten differnet locations that you would like the group members to go to. You will need 1 person at each site. At the beginning of the hunt you will give each group a number. (depending on how many groups you have is how many numbers you need.) And give them a clue based on the number they have. Each clue will lead each group to a different location. Set up a grid that leads the group to all ten sites but with each group going to different sites at different times. The 10th clue for each group should be the same. And the first group to make it to the spot the 10th clue leads them is the winner.