Lot's of nice riding in Colorado, but the proposed route seems like it circles much of it?
their purposed route, won't totally suck, but it does look to mostly skirt all the good stuff,. Just racking up miles, I was owner of an outfitter camp, in Colorado, saw lots of types of folks. I spent hours, weeks making tour plans, using maps. Some guest like a zip line tour veg and relax, some like raw hard core adventure. Denver to vail is hwy 6 or int 70, 6 is good. From Vail to Alamosa we used to ride to go ski at Taos New Mexico, it is allot of wide open valleys, it's pretty. Alamosa to cortez is kinda flat. cortez to montros your skirting the west and that's pretty flat to.
glen wood to Denver has a couple routes 70, or through kremling. through kremling I used to drive to the wood pellet factory; Kinda of a utility route. You should really do some work on you own and tell them what you want. if they are not willing they should be providing night time adult entertainment for their lack of work on their part.