I looked through this topic and I noticed that there wasn't a thread about the St. Anthony Idaho dunes. These are the most frequent dunes I visit, and I always have a blast. There are giant bowls and hills that blend smoothly with one another for a wide open in sixth gear ride. It also has a couple places where drag racing can take place such as Thunder Mountain and Choke Cherry Hill. The biggest bowl in these dunes is Dead Horse, I believe. It is just outside of Rexburg, Idaho and is open from late April to late September or early October. I'll let some people know when my group plans to head up there next.