At the University of Saskatchewan if depends on which part of campus and department you are talking about. For general campus computing Windows is the most prevalent. Having said that:
1. Can you bring a Windows, Mac, or Linux laptop onto campus and expect wired/wireless net access and support... Yes. Although the wired access is more rare but more departments are supporting "laptop stations" in labs sporting wired connections.
2. Is all of the software available for all three platforms and for personal installation... Of course not. This depends on the vendor and also on the licensing. The department of Computer Science, as an example, does have a MSDNAA license to give students access to MS software used. Where possible they use OSS that works on all three platforms. Where not possible due to licensing, etc. students can remotely access the software through a Windows and Linux clusters (if Apple would get around to releasing a decent clustering technology, i.e. terminal services like, there would be one of those also).
3. Can you use most campus services such as printing, VPN, etc. with your laptop (regardless of OS)... This depends on where and which department but generally most are supported as possible.
4. Will potential students on tour get blank stairs about Linux and Mac questions... likely.
I would suggest the following:
1. Contact the campus IT help desk and ask your specific questions. Most of the tour guides are volunteer students and may or may not have the answers you need or that represent all of campus.
2. Contact the department (specifically the IT staff) that your daughter is thinking of joining (Engineering, Ag, Commerce, Math, Comp Sci, Nursing, etc.) for her major. Ask your questions about Linux support. Note that sometimes the college that hosts the department in question may have a different IT support staff (Ex: Department of Computer Science has its own IT staff and so does the College of Arts & Science that the department is part of).