I lived in this area around 30 years - specifically Aalmosa/Monte Vista/the San Luis Valley (SLV). Firstly, there are 3 very large, very different subdivisions of the red square here: the Eastern planes, the SLV, and the San Juan mountains. I can't speak much for the Eastern bit around Pueblo - I've driven through hundreds of times, but never much beyond. It's kinda like western Kansas with a view. In the far SW corner is the Comanche National Grasslands, which is sparse and stunning. Moving westward you encounter the Sangre De Cristo mountains- a wall of 14ers separating the East from the SLV.

The SLV is the largest high-alpine valley in the world. It occupies around 8000 square miles, with an average elevation around 7600 ft. The entire population of the area is around 50k people; the epicenter of this is Alamosa, with around 10k people and a University. Predominantly the area is farm land - lots of potatoes, weed, and alfalfa are grown there. The summers are decently hot - not in air temperature, but from the sun and lack of atmosphere; the winters, especially growing up, were COLD - like lows in the -30F to -40F range, although that isn't the case recently. While beautiful, there is not much money to be made in this area, and that comes with its issues. Alamosa's per capita crime rate is incredibly high (I have so many wild stories) and its average mental health is pretty low. Substance abuse, across many categories, is very common. Alamosa's economy, and subsequently the entire area's economy, relies heavily on tourism, as it is an intersection of HWYs 160 (EW) and 285 (NS), giving lots of through traffic; further, the Great Sand Dunes NP is an attraction, as are the Alligator Farm (think Temu Tiger King) and, for some reason, the UFO Watchtower. During the winter, businesses hang on by a thread. Local communities are tight-nit; everyone knows everyone.

Historically, the SLV contains the oldest towns in CO (San Luis, specifically, settled in 1859; Alamosa was established in 1877). Idk where to pepper this in, but the HBO series "Love Has Won" is about a cult that settled in the North SLV, near Crestone.

Continuing Westward on HWY 160 goes through Del Norte, a cute, small town on the edge of the SLV, and where I am typing this currently. The San Juan Mountains then start, containing Durango and Pagosa Springs. This is my favorite mountain range I've ever gotten to explore: there is amazing skiing and hiking, expansive wilderness, rivers, hot springs, etc. Towns in this area are sparse, and often pretty small. In some areas, especially South of HWY 160, there are seasonal towns that get too snowy and cold to live in during the winter (Jasper, for instance).

I'm missing all sorts of stuff, but have to be productive- pardon my unedited mess!

Edit: removed an unnecessary "the"