Everyone knows about Arches, and Bryce, and Zion, but most visitors to the Utah parks miss Capitol Reef, and that's a shame.
If you want a look at early Mormon settler life, Capitol Reef offers the historic settlement of Fruita with its orchards, one-room school, and an assortment of other buildings. Walks lead into narrow canyons, to several arches, and to views of the many geological formations that are the park's prime attraction. And for an adventurous high-clearance drive, there's the spectacular Cathedral Valley loop.
Few national parks offer the diversity to be found at Capitol Reef - I have been going there for four years and still haven't seen it all.
Capitol Reef is a beautiful park and we had a great time there. If you had to choose between Zion/Bryce and Capitol Reef, the others are more magnificent, but CR is also quite beautiful and we had three gorgeous hikes. The town of Torrey only has a couple of restaurants but we stuck with fresh trout and were happy. If you like wine, bring your own. Restaurant selection tends to be really plebeian.
The varied terrain is amazing. There are black volcanic looking rock and the red rock that is so famous. There are petroglyphs that are easily accessible. There are several short day hikes that are worth it. This is one of my favorite places to be.