Yes
No reservations
If the area is empty and no reservation sign then its available. They do have buildings to rent but I'm pretty sure the outside area is fair game. Every time I go with family we just get to the spot we want with a grill and some benches and have the party. Never ran into any issues with previous reservations
And one more question. Do i have to rent the shelter or if its not being used can anyone use it?
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