is the park open on Monday the 28th for memorial day?

It is. Opens at 10am for the rest of the summer. Except on Sunday they open at 12noon. Get there a little early,so you can get lockers,tickets, close by parking,etc.

How much is admission

Yes

Yes, definitely

The current hours for the 2021 water park season 11-6 daily

So tomorrow they open at 12??