@srparent15 I know your son is in CS. What about yours @88jm19?
The CS building at UIUC was nice, my son said the class CS 225 (Data Structures) he attended, which was a large class (he estimated 80 or so students), was real comfy (and easy).
We stayed at the Illini Union, kinda in the middle of the campus and loved the vibe. There were many study areas, a food court and a game room (with pool, bowling and a bunch other game stations). The students seemed academic and chill - I know that is important for my son.
We will be visiting UMD next where my son got into the Honors which allows him (if chosen) to major in CS with Cybersecurity specialization while being part of a living learning community that explores all aspects of Cybersecurity. I have to say that one is very intriguing. I’m not sure how I would feel about UMD without the Honors but they do things differently with the Honors program.