Mui Ne is located a bit more than 3 hours away from Da Lat.
This place is very particular compared to the rest of Vietnam. Indeed, there are some places with dunes where we can feel like in the desert and another interesting place where we can visit walking in the river with bare foot.
The good plan would be to find an agency which propose these 3 activities or to rent a scooter.
This small map shows you where these 3 places are located.
As you can see, the White Sand Dunes are a bit far from Mui Ne (around 30 kms away) so I will try to organise myself and see which place I should visit first.