Weather at the National: HOT. SO, we cannot emphasize enough that all our crew(s) remind the guests, and each other, to drink plenty of fluids (waters and electrolyte replacements - NOT Red Bulls or the like) even though they don't feel thirsty; strenuous activity or not, that Anza heat will bring even the fittest person to their knees in dehydration.
Additionally, any attempt to shade one's body from direct sunlight will prove fruitful in such intense heat. i.e. long sleeve shirts, wide brimmed hats, eye protection, sun BLOCK, umbrellas etc. All attempts to educate will help minimize accidents. You'd be surprised how people will ignore something as simple as hydration.
So drink up!