We have visited a few parks in Utah and have returned to Arches and Bryce a few times in the past. There is a lot we have not seen yet, and we hope to visit again some day.
One of the nice things about Bryce and Arches is that with a car, there are many little hikes that you can do from parking lots to get to very pretty places or views. There is also the opportunity to do overnights with a permit, and I have camped at both parks before multiple times. it is very quiet in the evenings. Our one trip out to Horseshoe Canyon in the Canyonlands was very quiet as well, as any place would be that takes hours to get to and passes by nothing man made or man populated for miles. That is probably our most memorable trip.