We hiked between the lower and upper falls (maybe 2 miles round trip?) on the nature trail. We did it in the morning while it was cooler, although it is still hot. We saw no one outside of the area around the two falls.
Then we went swimming beneath the upper falls, which was busy, but not crowded and very refreshing after sweating on the hike. All in all, a good morning and afternoon.
Due to the drought, the falls were a little disappointing. Plenty of water for swimming at the upper falls, but not much coming over the falls. The lower falls didn't look very good for swimming and only had a few fisherman there.