Halloween // 5k race

Can anyone please give me some Ideas on how I can decorate my three wheel jogging stroller in a Friday the 13th/camp crystal lake theme please. I am Running a Halloween 5k and my 4 year old really wants to do it with my older daughter and I. She will be in the stroller on and off durning the race. I’m going to be a dead camp counselor. She is not part of the theme because she wants to be a princess 😆