Are elopement ceremonies allowed at the park?

I know most people opt to get eloped at the courthouse. However I’d like to do it by the beach with the view of the ocean, since I feel it would be beautiful, without a giant price tag. I was opting for making a reservation at a picnic table so my family can enjoy a catered meal immediately after. Does anyone know if there’s rules on hosting an elopement ceremony at the park, or if a permit is needed to do so? Any help is appreciated.