The Great Sand Dunes Wilderness changes in mood with the seasons, from the spacious solitude of winter to spring and summer fun and play. In every season, this unexpected wilderness offers opportunities to enjoy, explore, learn, and recreate in one of the nation’s unspoiled wonders. Great Sand Dunes is part of the National Wilderness Preservation System, which includes lands set aside to protect their unique natural conditions. Great Sand Dunes National Preserve contains the critical watersheds of Medano and Sand Creeks and is part of the Sangre de Cristo Wilderness.