If you plan to do any hiking or riding in the desert, come prepared with hiking shoes and a backpack to carry adequate water and food, a first aid kit that includes a snake bite kit, a flashlight, and some warm clothing in case there is a weather change.
Advise someone where you are hiking or riding (at least the general direction) and provide an ETA for your return.
Cell phone coverage can be spotty, but take it anyway for emergency use.