Are you able to go to the place where you'll be having this event and walk around a bit? I had a b-day party for my son last year at a local park, i went up the day before and walked around seeing what kinds of flowers and trees and whatnot were around, then I made up a scavenger hunt list of pine cones and dandy lions and fossils, stick shaped like a Y. I also went to the local dollar store and got some golf balls and army men and little things like that and left them in piles around the park. I split the kids into groups of 2 and gave them a brown paper bag and the list and had them go hunting together. This was for my son's 6th birthday and one of his friends brought his older sister....she said it was the funnest birthday party she had been to.
