For my daughter's 10th birthday, we had a road rally.  We split the kids up into teams of 5 and asked 5 parents to drive. I made up the clues (not too hard) and each team/van received a package of clues and goodies. On their way to each clue, the driver went into the goody bag and pulled out something for them to put on, like sun glasses or body glitter. They had to figure out the clue, put on whatever item it was and when they arrived at the clue they had to take a Polaroid picture with something or someone at the location.  Their entire team had to be in the picture. The final clue took them to a restaurant where we enjoyed a make your own sundae bar and opened presents.  It was a very good time.