We have an annual recumbent gathering called the Tater-TOT along the trails. I believe it is in August this year. We gather at Kellogg and do various day rides. Over the years, the entire trail will be covered. There are also many side trails to consider in the area. Just this week, I found a significant trail section out of Spokane as well.
I would recommend finding a good trailhead to start from and ride. Lots of facilities along the way. Even a week long stay would barely let you see all of what is available in the region.