Great Sand Dunes National Park is a unique experience that is worth the stop. The camping is nice though admittedly lacking shade in a lot of sites. Some sites can be small so pay attention if reserving for a mid to large size RV. The dunes are fun (try renting a sand board for a little adventure) but if you've done the sand and have more time Mosca Pass is a great trail with lots of trees and just outside the park is Zapata Falls, which is a hiking must! It is a short (.25 mile) hike to a beautiful campground. The ride up can be bumpy but worth it.