Your Welcome!
I added some more stuff, I am not for sure about Big Bastard and Gordon's wall, it's hard by Satellite, but they are in that area. I will edit some more tomorrow when the eye's aren't so tired.
As far as distance, the big kiddie track we camp by is maybe 2 miles up from I8? Someone correct me if I am wrong on the distance.
If you have any questions let me know. I remember being the new person in the dunes learning as you go with no guidance.
First time out getting the quad stuck I couldn't figure out why no one stopped to help.

Now I ride by new people and can spot them a mile alway.

The worst was going into Yuma for wood and coming back with palets. Never understood why people were yelling at us as we drove by until a few trips later, and I learned more about the nails in them popping peoples tires.