Sorry S., but allowing 9 year olds to run around the mall without a supervising adult for each one is downright dangerous. I know your daughter wants to have fun on her birthday, but keep it in a private venue. You can have a scavenger hunt in your home. Have each of the kids hide something small in your house. Then have them each fold up a piece of loose-leaf paper into, say 16 pieces, and tear them in the pieces. They number each one in the corner and fold it and number it on the outside with their name on each one. They then instruct the person who's going to read it to the next paper, and then the next and then the last paper will take them in the vicinity of what they've hidden. The person who finds the prize, wins. It's fun for the kids to place all the papers and then when they're all placed (they all have the name and number on the ouside), then you count to three and they all start running looking for the clues in consecutive order. The winner has to have all the clues in order to be the winner. Hope this helps - good luck.