When we did Zion and Bryce, we launched from Vegas, which was interesting with kids who were pre-teens. We stayed off the strip, but close to it (since the airport is there), and we visited the strip just to show the kids. Another cool thing was visiting the Hoover Dam (particularly in that I was working for Bechtel at the time).
We were going to go to Arches this year for Spring Break--taking the train from California out there (we have friends who want to host us in Moab), then flying home (after a day of Spring skiing at Park City). Alas, COVID-19 made for different plans. We're hoping to do the same trip next Spring. I was pretty excited about the Amtrak portion of the trip (sleeper car, going over the Sierra in the afternoon, and into the Rockies in the morning.