I've ridden all of them except Old Snow Basin.
Those roads aren't even as good as the roads that lead to the good roads in western NC and eastern TN.

I'm a bit spoiled because I spent so many weekends in those areas. I've all but given up day riding in the local SLC area because without hitting triple digits, I was bored. I'll probably pick up a DR-650 at some point soon so I can get off road a bit more than I can with my GS.
I've got a 2 week trip planned around Labor Day, 5 days around July 4th, and a 10 day trip around Memorial Day planned. I'm going to try and do 5-10 long weekends to ride everywhere within 600 miles or so of SLC.
For 1 day rides, I'll be doing those up at Miller Motorsports park. I like multi-day touring over just a normal day trip anyway.