When on the Red Dunes, take your time. Sun sets are spectacular, but after the sun has set colors are even more beautiful. I had never seen a sky so clear, and colors so bright. Definitely Mui Ne is a special place.
By the way, when I was here the road that leads to the desert was been reconstructed. I guess new tourist facilities will be built here in the coming future. The area of Mui Ne is becoming popular not only among foreigners, but also among Vietnamese from Saigon.
I only hope that Vietnamese will be wise enough to develop a sustainable tourism here.