Haha! A twilight Scavenger Hunt sounds fun! Uhm you could hide....
-An Apple( for the cover)
- A toy Lion and Lamb (For Edward and Bella)
- A Silver Hot Wheel Car ( For Edwards Volvo)
- A baseball (for the Cullens Baseball game)
-Vampire Fangs ( Haha to symbolize Vampires) (P.S: The Vampire fangs you use for Halloween)
-A diamond(or sumthin shiny to symbolzie a vampires sparkyl skin?)
-A Mirror ( for the scene in the Ballet Studio with James and Bella)
Hehe Hope you have a fun time! and I hope my ideas helped!