Yes you can have parties there and there is a very big play area with climbing things for the kids. Call them to reserve and they can give you other details. There was a party when we visited under big pavilion.
Edit.: birthdays and parties are allowed but you have to rent the space for it. You will certainly have to call and reserve a spot if you want to use their pavilionns/tables/space. You should also call their office and inquire about the jump house it may only be allowed if you formally rent your space
I truly don't know the answer to that. Sorry 😦
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