Do you need to have a reservations ?
When we were there last year, there were grills at the pavilion area down the hill from the parking lot by the building with bathrooms. I don't recall seeing any at the pavilion up near the school, but there might be some there too.
I'm not sure, I will ask my Son. Give me a moment. They used to have the metal grills, he hasn't seen any since they revitalized the park. There should be a website possibly. I would check that out first. Sorry I couldn't be of more help to you!! Have a great 4th of July!
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