Set out multi-colored paper cutouts in the shape of animals like ducks and rabbits as invites to the search.
Fill up plastic-type eggs with little toys, candy, coins, stickers, etc. 
Decorate your outdoor tables with colored tablecloth and streamers.
Stock the tables with drinks and snacks for hungry hunters.
Set up the playing area according to age groups, either dividing the area by age group and marking the boundaries clearly, or by color coding eggs (for example, blue and green ones for the older kids, yellow and pink for younger kids).
Hide eggs based on the age group. Go easy on the younger ones, leaving eggs on low branches and open places; challenge older kids by concealing eggs in pipes, bushes and even gutters.
Station supervising adults in designated areas of the hunting site at the beginning of the game.
Start the game off with a whistle, and let the hunt begin!
From eHow archives: http://www.ehow.com/how_12723_organize-outdoor-easter.html
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