DoI have to rent a pavilion for my sons birthday party at the playground area at estero park or is it first come first serve?

Actually, you can show up and just use one if you just want a small one and it's not being used. It's better to rent one. There are two? large pavilions and you can rent them online. They have charcoal grills. The one near the volleyball court is best for a kids party, as there's a playground next to it, and restrooms

I went there only one time bc my son had trac championship. I don't know much about it.

I rented one 4 or 5 years ago, I think it was $25 or $27. I think they all have a charcoal grill as well. Call "Parks & Recreation* or the Park itself for current rates.

Like others have said I think you have to rent. You can always call to make sure.

you have to rent

You have to rent one