I will not lie, this is not original. It was done in a group game I played and I thought it was a good spin on it!

There will be an idol at each camp. Players can search once every 12 hours for a hidden immunity idol. Clues will be given to players at various times. In order to search, PM one from each category to me (e.g. under the bushes to the east). You will not get a reply each time, but if you do find the idol, you will be notified. DO NOT START SEARCHING UNTIL THE GAME BEGINS!

Under
Inside
Above

Bushes
Large Tree
Pond
Tree-Mail
Beach
Water Well
Shelter
River
Overhang
Bridge
Fire Pit

North
East
South
West
Center