For dunes, I generally pick the longest line of sight, adjusting as I go.
Do you guys meet in Glamis?
We don't put on an get together in Glamis but our friend Morgan (brothersin250Rs) puts on a Glamis 250R meet typically over Presidents Day weekend.
The last time I went on a big weekend (new year's), I vowed to not do it again. Glamis in the old days was: no helmet, no flag, no major crime, no overzealous police. The best way to get a free(er) experience are the weekends between holidays. Best is mid-week. If you camp in the right spot you can even safely avoid the parking fee. If you don't need police, or the blm's toilet paper, I think you can have a clear conscience.