For the geological perspective on Ngobaran, see Michael's post at http://throughthesandglass.typepad.com/through_the_sandglass/2012/04/sunday-sand-ngobaran.html. There you'll find some of the sand shown in the photographs below (mostly Michael's) as viewed through a microscope.
First, the amusing "two roads diverged" signpost we passed. Pantai means beach.
Three photos I took that amazingly weren't overlit or out of focus. There were a fair number of Indonesian day-trippers picnicking here and no one was eating this bizarre fruit. I have no idea what it is. Couldn't find a match with a reverse image search via TinEye.
The fruit that fell to the ground looked like enormous extracted teeth in candy corn colors.
Two shots of tafoni.