For the past few years, our neighbor has put on a neighborhood easter egg hunt. We all drop on a bag of candy and she fills about 1,500 plastic eggs. Then the older neighborhood kids hide them around our cul-de-sac and the youngers find them. That along with a pot luck breakfast and there's something for everyone. Seth didn't quite get it at first, but caught on in the end.
This grabbed his attention after finding 2-3 eggs... then it was over from there.
He wanted to put the empty eggs into his bucket at the end... yep, he got the idea by then.