How Much Can You Learn in 73 Minutes of User Research? describes one persons experience standing on a street corner and observing bike riders.
When did you last take some time to watch how people use your library? It is possible to learn quite a bit about what people think of your institution without having to conduct a survey. Why not connect with a few of your work mates and assign some times to record the goings-on at your library or in your department. Then debrief over lunch at the end of the week and make a list of next steps.
When reviewing your observations, remember what one commenter said:
“Like it or not, in making an observation on anything you are also making an observation on yourself.”