Ok, here is the deal. If you are a sand junky, and only go to Glamis, be aware. This place is not all dunes. Think twice about running paddles. It is very rocky, and will tear your paddles up when riding on the flats. However, the dunes themselves are so soft, you will be dead in them with out paddles.
The dune or dunes, only a couple, are massive! Worth going just to see.
Now, if you are a dirt junkie, this place is cool. Just be aware that a lot of sand guys go there, and their paddles will throw to rocks a good way in their roost.
I like it here, but the weather is fierce, and it is not for the faint of heart.