We used to come to this area when the kids were younger and let them feed the fish and ducks with a whole loaf of cheap bread. I haven't seen many ducks here lately.
You're looking for a well hidden little box. Bring your own pencil. Cache has room for small swag. Don't bother the residents while you are here. They'll kick you out at 10 p.m. either way.
Warning: The hint might give it away.
V'z ba gur srapr ba guvf bar, jurgure V fubhyq tvir lbh n uvag be abg.