We drove the 4wd back road to Darwin Falls, a year-round waterfall in Death Valley NP. This road starts at the ever-so-sad old town of Darwin. The town is not named after Charles Darwin, but instead is named for Dr. Darwin French, a 19th century adventurer prospector. It helps that the road is shown in my Garmin Nuvi. This is the 3rd or 4th time I've driven the road, and it gets easier each time.
Here's the only NPS web page I could find that mentions the Darwin Falls. Along the way, we stopped off at the China Garden Spring to see the pond with goldfish. This is a very nice place to stop and rest. It'd also be a great place to have a picnic.
Near the end of the road, we pulled into the parking area for hiking to the falls. It took us about 30 minutes to hike to the falls.