If you want to do one of the passes, Ophir is the easiest, then Imogene, then
Black Bear. Ophir is plenty easy for your Bronco and less 4x4 experience - it gets a little more difficult on the Ophir/telluride side (exposed rock field) but it’s ok as long as you wait for the trail to clear coming up.
You shouldn’t do Black Bear unless you’re super experienced.
I like the black canyon of the gunnison NP and the Durango Silverton narrow gauge railway but both are a little outside Ouray