Do you need to reservation for a BBQ grill and picnic table or is it first come first serve

Both options are available .

Reserved areas and first come and hold for many areas on both side of the park

There is a big covered event area which I think you should call to reserve. There are a lot of picnic or bbq area around the park which are first come first serve basis.

It's first come first served, but they also have areas that came be reserved for a price. Of course prices vary.