You are looking for a little black pill container!!
In this area you will find some graffiti, random piles of garbage and a completely useless fence. The graffiti is generally decent here. The garbage is a little bit of everything. The fence is mostly aesthetic as it's pretty short and there are entrances through it frequently...
This container is about 2" in size. You will need to bring a pen or pencil with you. When closing it's easiest to put the paper in the lid first. Happy hunting!
FTF goes to ttomw! He noted there's poison ivy here so be careful searching.