Your dog would have to be on a leash. You will SEE the snakes before you even get out of the cars usually....park away from others so none hiding behind a car wheel. Generally, snakes will move off to somewhere when people are around. A snake spread out......not coiled can't strike. Don't let your dog wander where you can't see ....like behind a bush. The only thing I wonder about....it's hot there.....will you be leaving your dog in the car when you go into the visitor's centers? They aren't allowed in unless they're a service dog. Leaving the dog in the car is FAR worse than worrying about snakes.
My mind is a garden. My thoughts are the seeds. My harvest will be either flower or weeds
Dee and Bob
plus 2 spoiled cats
On the road FULL-TIME.......see ya there, my friend