The dunes are pretty impressive, and they allow for great views at sunrise. You can see pretty far out into the expanse. Walking around them is no problem at all, it's not a far walk to the highest point to catch a fantastic panoramic view.
However, if you don't like noise pollution, then you'll want to skip this. I get it - I've lived in Vietnam long enough to know that if there's a way to make a buck off of a foreigner, they'll figure it out. But the ATVs/quad bikes are pretty obnoxious. I'd rather them ban those and have to pay an entry fee than to put up with the noise and tourists who are driving them when it's clear it's their first time doing so.
A great place ruined by noise and generally obnoxious behavior.