The types of questions that were most helpful to my daughter’s were those that helped them figure out the campus vibe/activities and how that worked for them.
The least helpful questions were those that were simply factual questions where the answer was readily available on the school website.
Our best tour was the one where the weather was crappy and my daughter got a 1 on 1 tour. This meant the tour was completed shaped around her needs/desires and she and the guide just chatted away during the whole tour.
I stand by my view above that the role of the parents on these tours is to trail behind and listen. The worst tour we had was one where the parent’s dominated and gave the kids no chance to ask their questions.
There was 1 school that separated the parents and kids and did separate tours-- that was a model that I also really liked. My kid did too because it meant we could compare notes on what we heard.