One of the finest biking roads I've ever ridden is on the way. Go to Missoula, MT and pick up U.S. Hwy 12 westbound. You'll travel up to Lolo pass and then there's about 125 miles of twisty canyon road following the Lochsa and Clearwater Rivers. The beauty of this stretch of highway is that it runs through National Forest and borders on Wilderness areas. There's virtually no local traffic to deal with. The views and the curves are spectacular. Whenever I'm within a few hundred miles, I'll make a detour just to ride that road.
Here's a few pics :


Here's an overhead view. Every time I fly over that road, I wish I had room for a bike on the plane.
The road twists along the bottom of the canyon as far as you can see.

If you have camping gear, you can set up on any of the many forest service roads that meet the Highway or use one of the many forest service campgrounds. If not, continue on to Grangeville, ID (the Elkhorn Lodge is biker friendly and reasonably priced) or press on to Lewiston ( a college town with lots of accomodations).
I first stumbled across this road back in 1985 and it's remained on the top of my list ever since. Don't miss it!