I hiked into Donut falls by myself (sorry mom) yesterday evening. It was an easy hike, but way to many people. The falls were nice but I didn't climb to the top to see the cave as I knew the light would be too poor.
Even here, the light was hidden behind the mountains and the entirety of the falls was in shade. Of course I forgot my remote shutter release so I couldn't go above 30 on the exposure.
I'm satisfied with this, although I'd like to revisit during better light in the morning.