I kind of doubt the areas of drilling they're considering in National Parks will be those that impede or are located in high traffic tourism spots. My dad as an oil field supervisor had to travel long hours to get to sites out in the middle of nowhere on mostly leased areas of the King ranch in south Texas. I rode with him on a couple occasions just to see what he did for a living. It's big sky country along the lines of the movie "Giant".
The real problems are the affects of building infrastructure required to get to remote sites on National Park land. Roads have to be plowed and gravel paved, trees removed, nearby lodging built, food provided, etc. And then there is the clean up regardless if the well produces or goes bust.
Drilling sites aren't particularly clean places to work. Believe me. It can also stink of crude oil (smells like motor oil mixed with sewer...it's that bad). But it only smells within the area of the drill site. I wouldn't think in those remote areas they'ld be close enough to campers and hikers.