This is the same size as the other water parks in the area, it has a theme like the other water parks in the area, while I am excited that it has some thrill rides, it is still a water park.  It won't be priced as a theme park.  If they do, it will be a mistake.  People will just go elsewhere.  While it is cool and probably worth an extra $10 a day, no way this is worth $50 more than the other water parks.
Also, I think it is a huge mistake to market it as a 3rd park.  it is not a 3rd park.  It is a water park and should be marketed as a water park.  Tourist get sooooo confused over the simplest thing.  Can you imagine them going to the "3rd theme park" and not realizing it is a water park?