We backpacked into the dunes for about 90 minutes. First we had to cross a small stream about 30 yards across - 12 to 20 inches deep. There’s nothing like camping on a sand dune - no lights visible as far as you can see. During the night the winds whips up and blows the sand very hard. The Park Rangers estimated the wind gusts reached 30-25 MPH during the night. It was crazy loud. In the morning we had sand everywhere - mouth, nose, inside sleeping bag. Be prepared for gusts over 15 MPH in the spring.