After a great night sleep on real beds, we cooked breakfast and set off. The day was pretty tame for GDMBR standards, until the ride dropped us on an old rail line that was washboarded with loose volcanic sand. We were forced to ride it for 2 miles, but eventually we made it to a section where a nice dirt road paralleled it. The up and down of the washboarding combined with the loose volcanic sand, made it the worst section imaginable. To us, it made absolutely zero sense to be forced to ride it another 15 or so miles, especially when there was a perfectly good dirt road that was 30 feet off the side. We both highly recommend you get off the lava sand as soon as you can, your insanity will thank you later on. We continued on and found a very nice camp a short while later at Warm River.