If you are arriving on a weekend and the weather is nice and warm, water parks can be jammed with locals. Nothing whatsoever against the locals who enjoy these parks, but you can find yourself parked in “overflow” parking, and have a tough time securing lockers and lounge chairs. Lines for everything are long, and the experience is just not the same. Our family did it once last May and it was CRAZY.
As noted above, having both parks open may alleviate the crowds, which sure would be nice for everyone looking to enjoy some weekend time. Fingers crossed!