Sue;
Here's an idea that my friend did for her son.
She got a lot a balloons ( enough to fill her livingroom )
She then put little toys and candy in them. The kids got to play in the balls and towards the end the boys popped all the balloons. And what ever was in them ( the ones they poped ) they took home.
Another idea that we did for my son was...
We did a water party using the water balls ( you can get them at wal-mart 2/ $0.97) and water guns. We set water buckets around the back yard and let the boys have at it.
It was alot of fun. We let the big people know that they were fair game too, if they were in the back yard. We had alot of big people join in. It was soooo much fun.
Hope these help.

Houston-Mom