Two weeks ago, my brother and I took our kids (ages 7-10) climbing at White Cliff, just barely outside of Frisco: mountainproject.com/v/white…
There are three easy single pitch routes on the east end that are well bolted. I led them and set up top ropes (50 m rope is fine) on solid 2-bolt anchors. It might be possible to set up your own top rope anchors if you want. There is access to the cliff top, but anchors could be a ways from the cliff edge where things get vertical.
Access is short (10-15 min walk), but steep, on a clear trail. The base is reasonably safe, possibly sprained ankle territory, not worse than that though. The base has a little shade from small aspens, but not a ton. The climbs get sun most of the day. There is some highway noise, but not any louder than 5 kids.
Everyone had fun and wants to go back - that's a good sign.