Hi,
I don't know if this is too late to help you out or not. It has been awhile since I was a collegiate, so I am not sure what Nationals might consider "hazing".
We went to the local zoo. We started at the entrance and all the little sisters got clues. These clues led to different animals. After visiting several different animals, as the final clue... All the little sisters got a stuffed animal... they went to that animals area and their big sister was waiting there for them.
As I said I am not sure if this would fall into the "hazing" category or not. When I got my big sister, we got to go on a scavenger hunt around town...which was real fun. Before I graduated though, this was considered hazing , so we could no longer do it. That was back in 1980's, so I am not sure how the hazing policies have changed since then. Hope you have fun.