I believe we were given a small map that showed the relative positions of the facilities Squibb, 124 and 107 Columbia Heights, the Adams factories, Willow Street, the Towers Hotel, etc. I believe the visitors used to get a similar map. I'm thinking it even showed the path that was walked to get to the factories and the tunnel between 124 and the Towers. (You'd pass the laundry area through that tunnel -- ahh! the smell of thousands of socks all at once.)
Check out the links on this page on Randy's site to get info on each of the current properties in NY.
As far as hiding places, well I don't know how much good they'd do you in shirking your assignments, but the Squibb buildings were the best ones to take Watchman duty in. In the late 70's and early 80's there was still a lot of space they had never used. (I would always trade KP duty for night Watchman because I thought I needed no sleep from age 18 - 22.) I even took night watchman duty for friends as friends. And, no it wasn't because teenagers would sneak around the factory buildings at night to make whoopie on the slippery slopes between the factory buildings and the concrete culverts and retaining walls adjacent to the streets running nearby. The buildings looked so abandoned at night in those days, that these poor kids thought they had privacy -- but this is something I never took notice of. It never crossed my mind that a cup of cold water poured from an open window above them would still be cohesive enough (to feel like a slap on their bare skin) from about 4 stories above, and yet would disperse into too many fine droplets from 8 stories above. It never occurred to me!