My mistake. I googled it after I posted my comment and I guess a child did pass away from the parasite. I thought they just discovered it in the waters and couldn't get rid of it even through filters, so they closed the park. I learned something new!
Regardless, to the OP- I wouldn't worry too much about it. It's a sensationalized "danger" that always makes headlines when it's discovered, but is still very VERY rare. Even if you somehow got close enough to inhale the water from the shows through your nose, the cases where people have died from this thing have had water poured into their noses (like with untreated neti pot water), or had water forcefully shot up their nose by jumping into a warm lake or as someone else said, from getting water shot up their nose while sliding on a slip and slide.
According to the CDC, they started keeping track of this nasty thing in 1962, and from then until last year, only 133 cases in the US have ever been known. That makes it EXTREMELY rare.