Over the past couple of weeks, I've seen the same fat guy on a green scooter riding up and down the multi-use trail along Lake Banook. My hunch is that the scooter is electric and I notice that he does not have any plates for it, but it definitely does not fall under the category of bicycle or wheelchair. I've read the Motor Vehicle Act over and there is absolutely no way this machine should be allowed anywhere except the road.
So get off the trail! It's for pedestrians, cyclists, skaters, etc. not for you! If you aren't confident enough to ride it in real traffic, then maybe you should stick to walking. —Also, Please Stop Staring Like a Creep