FHE idea: The Temple Quarry Trail near Salt Lake City is a fun, short nature walk for families. You can still find chisel marks in the granite boulders along the trail. Link to more information about the Temple Quarry Trail here.
A gorgeous Utah hike near Salt Lake City! This trail leads to a reservoir AND a waterfall! The reservoir trail is kid friendly and the waterfall trail is a bit more strenuous. But totally worth going to the upper falls!