Video Scavenger Hunt Pary-- 18th Birthday

I am trying to plan a video scavenger hunt for my 18th birthday. We are going to break up into groups, each group gets a video camera, and we are going to go downtown and do various things on the scavenger hunt list which can be documented by the video cameras. My problem is I need ideas for the activities on the list. I can think of some, but they seem too little kid-ish for 17 and 18 year olds. Does anyone have any ideas?