I think the first tours are most important.
If a school is expansive and you are overwhelmed - you see it - regardless of what you thought before.
If the architecture bothers you, you know it.
If it’s too small - as RHIT was for my son - you know it
If you tag onto a vacation like @lindagaf said - we did FSU that way on a beach trip - it’s great.
But even if schools are far away and you do one at home - it can help.
of course, not all large schools are large geographically.
But my daughter - we knew after a few - had to be in a city-ish area - so we knew those off on their own would not work, not matter how nice - like Elon - gorgeous - but no chance with her.
So anything you can do to see a school - even if not for a ton of time or even if not on your list - they all help.
The reality is - we all only have so much time so we can’t do it perfectly - and when you travel far, you have no choice but to double up.
But you start early, take a break so you’re not burned out and get them done.
Take notes immediately after - what you liked, what stood out, what you didn’t - or it’ll be forgotten the next week and the kid will say i don’t remember.
Spend breakfast, dinner in the surrounding area, etc.
If you see something isn’t working…take note why - and haul out - so you keep the mind fresh.
Visits to schools you don’t like are just as helpful as visit to schools you do.
After 3 or 5 visits, you know exactly who to target and who to let go.