James:
Zion has some pretty easy but very pleasant trails all along the canyon floor. The 2 mile Riverside walk is relatively flat, shady most of the way, and sprinkled with benches. It ends at the spot in the river where those hiking to the narrows climb in and start wading upstream. Lots of folks take off their shoes and cool their feet. The Emerald pools trails are also fairly easy and there are often waterfalls to be seen. In addition, there are numerous pullouts along the road leading to the East Entrance, with interesting natural features to be seen within a short walk.
In Bryce Canyon, there are many, many pullouts and viewpoints along the road to the top. Trails in the area of Sunrise Point and Sunset Point are pretty easily navigated.
BTW, If you get bored, the North Rim of the Grand Canyon is a couple of hours from the East Entrance and both the Vermilion Cliffs & Cedar Breaks NM are even closer.
Jim
P.S. In case you are thinking of striking out on your own, Angels Landing is not for the faint of heart. Glad I did it while I was still young enough to be fearless. Now, if I had only been smart enough to take a camera.