McKenzie Pass Highway I think it is 242 is very beautiful, Dee Wright Observatory on the top, great view of mountains and lava beds. A few hikes from there as well.  Crater Lake is a couple hours away, a must see.  The John Day fossil beds to the East of Redmond holds some great roads and very picture taking opportunities.   I am sure there are more you will find as you get there, but those come to mind'.

Hwy 20 is a great road, well shadowed and can be mossy, but it's gorgeous all the way down to I-5. Very scenic mixed evergreen and deciduous forest, with a stretch that goes past one (or two?) of Oregon's reservoirs. Great dam views, too.