If you can’t get a guided one through admissions, consider doing a self guided one:
Here’s a link:
https://pocketsights.com/tours/tour/Ithaca-Cornell-University-Campus-Walking-Tour-29
It’s good to get a general vibe about the campus, maybe talk to people while you are out and about, check out the areas on the perimeter such as Collegetown and downtown Ithaca, the falls. These places all make up an important part of your whole college experience at Cornell. You can find out a lot about a particular college and major by going on the school website. Maybe you can contact the department directly and get some ideas on how to make the most of your informal tour.
Good luck!
P.S. in a couple of weeks school will just have started so that may be a weird time to do a visit as your expectations may be high but the campus vibe will be somewhat off with classes just starting