From Denver to Rocky Mountain National Park

We will be leaving Denver in our 38 foot class A gas powered MOHO while pulling our toad, to Estes Park. Any suggestions on which route to take?
If I can add to that, from Estes Park to Montrose.
Thanks, JMAT

We went from Cherry Creek State Park in Aurora, to Estes Park in July. The fast route for us was 25 north to 66 east and then 36 North at Lyons. I do not think you could find a faster route. CO 66 was a brand new wide concrete highway on the north side of Longmont to Lyons for the most part. Go north on the 25 past the 119 exit to Longmont and get the 66 west. 36 is scenic up to Estes Park for everyone but the driver.

I'll leave the Montrose leg to others!