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I go to the dunes almost weekly in my LX. Things I would recommend:
1- Tires: 15 PSI. Less if you got stuck, but not for long.
2- Center diff should be locked.
3- 4HI (with 1st - 3rd gear) when driving and 4LO with crawl control when stuck. Alternatively, 4LO with 4th to 6th gear would work as well.
4- Turn the side airbag off.
5- Turn the Air suspension off.
6- Unless you are stuck, keep the traction control off.