I really do feel for you. I have been there only once and had a Jeep ride and remember sand going in to my mouth when tried to talk or shout woo hooo! from being on the Jeep.
I did not know one can walk and did not see anyone walking. The sand is so hot and soft.
Did you not pay the full price for Jeep ride and they made you walk??
(No offense please. I am just pulling your leg. I would have tried it myself though for extra fun)