I used to hate having any human subjects in my landscape shots. I still don't like to. However, sometimes you need to include people (or animals) to add scale (and interest).
This photograph shows two hikers making their way up on the two biggest mesquite dunes in Death Valley. These dunes, while fairly large are quite a bit smaller than the Eureka dunes (also in the park but a little more remote) and the dunes found in Colorado. That being said, take a look at how small the two figures are...just dots on this example and barely detectable ( and hence the bright red markings I had to put to point them out). On a 13"X19" print they are easily seen and add interest and scale.
Camera: Nikon D200
Lens: Nikkor 70-200 @ 80mm
Shutter 1/300s @ f6.3