To go to the water park do we have to lodge there or can we stay at a hotel near by and just go to the water park separately.

You dont habe to stay at the water park but you are more likely ro save money with one of the packages. Just check out the deals and compare :)

You don't have to stay there, the water park can just be a day trip itself

You can go to the water park from any hotel you want. They have 3 joining ones attached for your convience but not mandatory

Either

They sell day passes.

Yeah u can just go to the waterpark without saying in the hotel