We, too, have used a paper guest register for ages. One of the biggest reasons is that we are a free museum so there's no other way for us to gather data from our walk-in visitors (because no one is purchasing admission). We are also a historic landmark, so some feel that having an old-looking paper register adds to visitors' feelings of "stepping back in time" when they come to our building. Also I think a while back we had a disaster plan and having a sign-in book was in there as a way to know how many people/who were actually in our building should something happen.
We ask for name, address (specifically city, state/country, zip), # in party (children and adults), and how you heard about us. We have a Visitor Engagement Facilitator who loads all the data into a spreadsheet at the end of the month and she recently started creating a visitor report to be shared with staff each month.
The information is mostly used for grant reporting (so we can say we had XXX visitors in 2016 from XX different states and XX different countries), but we've had ongoing discussions about what other ways we might be able to use the information. For instance, we wonder how we can use data (emails, addresses, etc.) to convert free, walk-in visitors to donors or program participants, or to see how many walk-in visitors actually do convert in these ways. Having the data entered into a spreadsheet has been useful because we now manipulate it - one of the things it allows us to do that I think is interesting is to see trends in visitorship, such as the heaviest months of the year and heaviest days of the week. That info might be helpful for future decision-making about scheduling.
------------------------------
Cara Scharf
Program and Communications Manager
Wagner Free Institute of Science
Philadelphia PA