Bring your cameras: this waterfall is extremely photogenic! To best capture the colorful rainbow mist, try to reach the falls at midday when the sun is highest in the sky (Source).

During peak tourist season, you’ll have to board a mandatory shuttle at the Mammoth Adventure Center in order to reach the trailhead. Personal vehicles are allowed up the road to the trailhead outside of the shuttle season.

While most people stop at the upper falls, a less-used trail continues further down the river to the lower falls. This section is guaranteed to be a bit more runnable thanks to the lower traffic!

Sources: https://www.mammothtrails.org/trail/78/rainbow-falls-trail/ https://en.wikipedia.org/wiki/DevilsPostpileNationalMonument https://www.visitmammoth.com/adventure/rainbow-falls