Do they have place for a family to bring cooler with food drink to water park, that has seating and shade for adults?

Love this place.

Can you bring a back pack in the park?

First come first serve on the shading for adults. For as the water coolers, I don't think you can have those.

There are some places. But first come,first serve. You can also reserve cabanas.

I think there is, but it has been some time since I've been there