After each picture is taken, someone from that team sends the picture to one of the youth workers. The first team to successfully send each picture from the list to the youth worker is the winning team. You will want to have a lot of pictures for them to take because this game goes pretty quickly.
Another option would be to provide adult drivers for each team and make it more challenging by giving them pictures to take of specific places and things around the city. If you have the helpers and necessary vehicles, this would be great, but be prepared for certain problems this could create.
Have a great time with this activity! And as always, please comment below with any questions or suggestions that would help.