Come on, there isn't much out there that sounds cooler than sand boarding. Low and behold Southern Colorado is home of the US's largest sand dunes and one of the best places to check this off of your bucket list.
Outside of the national park there are two different companies that can rent sand boards and sleds for your day use at around $20 per board per day. However, If it is raining a lot and the dunes are too wet, or if the dunes are frosted over both companies will not rent out their boards in order to maintain quality.
(Kristi Mountain Sports will also have boards available for purchase and is open year round. The Oasis Store however does not offer boards for purchase and is closed during the winter season.)
Make sure to get them fast. These are very popular and it is not uncommon for them to rent out all of their boards in a given day.
Once you get get your board you should then make your way into the park then ask the ranger to direct you to the dunes if you need help. As with all other national parks regular fees are applicable.
Parking by the dunes will likely be packed. You might get lucky like us and find a spot right at the front. If not, a little walking never hurt no body.
Next, you'll walk along a short path and across a small creek and boom! you're at the sand dunes.
With heat and the parks elevation of 8,170ft at the visitor center, getting up these sand dunes each time will be physically demanding. It's totally worth it though!
For more detailed information I recently wrote a blog post on this adventure! Go check it out if you're interested :)