Today I present to you the "coral pink sand dunes" from southern Utah! (At least 2 square kilometers are definitely there)
There is a southern part of the dunes with some vegetation and steeper cliffs on the hills to the east.
There is a closed-circle racing track in the center of the map. The layout is based on one of the longer Texplex courses.
Overcoming all the dunes is an 11-kilometer route.
There are dozens of kilometers of trails in the mountains to explore, which I have arranged so that they are something like a maze to make the trails seem longer than they actually are.
All trails and courses are numbered. Not that I think AI can handle them all, but so that you can see the paths in the navigator.

In version 1.3.1:
This update should solve the problem of trees without textures, as well as update the grids so that they are from vanilla files, not copies from the mod itself. This will reduce the file size slightly. It will also fix some rocks that can't collide. Overall, I think the new grids make the map much better than before, especially in the mountains.
There may have been other small changes to the map since I returned to it from time to time, but it's been too long to remember everything.