Very cool about your origins; had no clue. I'm not sure if your parents retired around Zion/Springdale or a small hop away, like St. George.
It's a real embarrassment of riches out there - state wide, truly, but somehow even more so in that SW corner. We had originally hoped to include St. George. We were basically there, but it just didn't fit. Ditto Kanarraville and New Harmony.
If you get into the nitty gritty, including not just parks/towns but named hikes/sites, there may be a literal hundred reasons (on our scratch papers and word docs) begging us back to that SW corner of UT. And that's just what Google helped us know about.