A variation on my "PNW" suggestion... North East Oregon -- "Blue Mountain" region. Absolutely some of the best roads I've ridden in this region. OR DOT takes great care of the roads... routes are fun-fun-fun; some with great "sweepers" with an occasional switch-back thrown in. Many bike rallies are based out of towns like Joseph, OR or Pendleton, OR (larger of the 2). In both towns, hotel and camping options.