I've just toured a Florida university with my 17 year old DD2. Very interesting.
They have some classes outside, under cover.
Some classes are hybrid - with the group split in two, and doing half the classes in person and half online.
Some classes are fully online.
They have turned every possible available room into a classroom in some way to give them more space in which to teach.
It seems most students are living back on campus.
No one is in a double room this year - everyone is in a single. I actually can't imagine how they've managed this, although they had already just built some (lovely) new accommodation blocks which I'm sure has helped.
Students all keep their Covid app up to date, and wear masks everywhere. Social distancing everywhere. Regular Covid testing.
It seems to be working. DD really wants to go there - probably something to do with endless sunshine and 3 outdoor swimming pools 
Meanwhile DD1 has had a foot of snow in the last 24 hours, and it's about as cold as it's ever been in Chicago.