For several ears we've enjoyed exploring and playing on the dunes in our own vehicle. On our last visit we opted to add the tour and I'm glad we did. Our tour guide was knowledgable and funny. He took several family photos of us and to our surprise he even included a few of himself.
Be aware of where you sit though, especially if traveling with children.
The line to get on the dunes can get quite long if you are going on your own so take plenty of water and snacks.
The views are gorgeous!