Conversation so far:
where are the great sand dunes of colorado located
The Great Sand Dunes in the San Luis valley, are on the eastern edge of a valley in central Rocky Mountains. To the east are the Sangre de Cristo mountains.
What is the height of the Great Sand Dunes
The Sand Dunes rise 750 feet above the San Luis valley, the tallest sand dunes in North America.
What else is in the area of the Great Sand Dunes
The Great Sand Dune is a park and preserve containing the dune field along with the ponderosa, spruce, and aspen forests. Medano Creek flows through the middle of the park.

Question: What month is the best to visit
Self-contained rewrite: What month is the best to visit the Sand Dune Park