There are several scenic routes you could take, but I'll limit myself to that which I've run myself, more than once.
From Everette, go down I-5 to Eugene, OR, then east on OR-58. It runs up through some beautiful country as it climbs into the Cascades. At the junction with US-97, turn south and go down to Klamath Falls. You can stop along the way at Crater Lake, if you'd like.
From Klamath Falls, take OR-39 down into California, where it turns into CA-139. The Lava Beds National Monument is right there, which is also the site of the massacre of Gen. Canby during the Modoc Wars of the 19th century. There's a lot to see and do around there, including Cpt. Jacks' stronghold.
CA-139 takes you through some high country in a gap between the Sierra's and the Cascade's. There's no real uphill or downhill sections.
At the town of Canby, go east on CA-299 to Alturas and pick up US-395 south right into Reno. You're now on the east side of the Sierra's and it's a pretty dry and desolate countryside, remakably different from what you just came through. In the little town of Standish, look for a sign pointing down a county road to it's junction with US-395 again. It cuts off having to go through Susanville. Stay and play in Reno/Sparks, if you'd like, or visit Lake Tahoe which is only right over there.
From Reno, get on I-80 east out to exit 46, then take Alt. US-50 into Fallon and US-95 south right into Vegas. You'll be out in the God-awful Nevada desert for the whole trip, but the view of the Sierras off to the west is magnificent. So too emptiness of that part of the Silver State. Watch your speed about Goldfield, though. At night, you might even see some strange aircraft flying around as a goodly part of that portion of Nevada is controlled by the US military and God knows what they've got out there in the dark. Area 51 and the nuclear test site aren't far away.
If you're so inclined, there are several cathouses you can visit, including one which use to have a couple of wrecked airplanes in the front yard. It was at Beatty or Amaragosa Valley and I assume it's still in business. By the way, from Scotty's Junction, Beatty or Amaragosa Valley, you could take a side trip down into Death Valley. I've never done that, so you'd be on your own. :-)