Funny things to do in public?

So it's my friends birthday coming up, and my group is taking her into the big city (we live just outside it). We're going to take her to a few places, but over the day, we're going to give her a list of things she needs to do. For example, ghosting people, asking strangers for their numbers, pretending she knows someone, go up to random people and ask "How are you doing?" to see what kind of conversation she can start. They don't all involve strangers though. My friends and I are running out of ideas though. Anything ideas from you would be great. Keep it PG though, we're only teenage girls.