Each team of two or three kids gets a safari clues list.
The team must use the clue list and photograph the location they believe is correct within a determine time limit.
When everyone returns, someone takes the photos to a one-hour photo shop (you may be able to prearrange this so you can get them in less than an hour).
The party continues with lunch or dinner.
When the photos are returned, display them on the wall.
Photographs of correct locations will be judged for artistic quality as well as accuracy.
Award prizes in many different categories: most artistic, picture furthest off the clue list, most locations correct, etc.
Note: Make sure everyone participating has a bike helmet and understands bicycle safety rules.