This is a great trout stream. Also great for putting your feet into. If you go fishing be sure you have a license. The lower part flows through Philmont Scout Ranch and parking along this section is prohibited.
The Cimarron Canyon is a favorite of my family to go fishing, sightseeing, and hiking. If you ask the locals in Ute Park where the good fishing spots are, they will be more than happy to give you some spots. Make sure and stop at the old man face and the palisades for some interesting history.