http://www.motorcycleroads.com/75/944/Colorado/Colorado-National-Monument.html
I like to plan rts by searching sites like this link..
They usually have them ordered by extreme twisties/sweepers/scenic other....
I put in as many extreme twisties as possible, then connect them using sweeper roads or other(if needed) to make loops where possible (though out & back can be warranted at times).
Of course, all options are open once you are in motion. I like having a plan & twisties are my goal. ;-)