High Schoolers Walkin' Traditional Cache

This tunnel with guard rail used to house a Sophy Brown cache hide back in the day. I've been having thoughts of something creative with this tunnel area but haven't quite nailed it down yet. Since Sophy's old cache has been archived I thought I would jump in with a cache of my own at this location to hold the spot for something more impressive in the future. This can be a very busy muggle area at before and after school hours. If hunting with high school aged muggles around please be very VERY stealthy to preserve this caches life in the game. Much appreciated.