On a quick visit
"Working mill, rodeo, native america"
Getting to Pendleton from SLC in 9 hours we were just in time to visit the mills and take a free tour. It was very interesting and educational. Afterwards we shopped in the seconds store and got some good deals on nice blankets which had some minor flaws.
Pendleton also has the rodeo and a Native American center that might be worth attending on another visit.
It was a nice town on a quiet bend of the Umatilla river