Crowd levels on opening week

How bad are the crowds on the opening week? I know the park opens first on March 21, but the next week is fully open (I assume from spring break). It'll be my first time there and I'm planning on going during one of those weekdays.

Also, I do have a gold pass so I can go multiple days if I have to.

Also again, just to make sure, what's the chance Pantherian is open?