This was incredible! I ended up going when they got hit with a snow storm which added an additional challenge to making it up to the top as it was! I could barely see the Ridgeline but when I got to the top the storm cleared and you could see the whole dune field with the mountains in the background! Very challenging but so worth it! Since there aren't marked trails you can make your own adventure getting down (or up) and there is so much to explore! It was cool watching the snow gradually melt off the dunes as I descended! The visitor center is great as well!