Padre Balli is a pit. Don't believe the photos on their website. There's not a lick of grass in the RV area, and any grass in the surrounding areas is full of stickers.
This is what it really looks like:
The only "amenities" are a 30-amp electric and water hookup. There are dunes between the parking area and the shore that block the view of the ocean.
Everything in Corpus gets corroded in about 15 minutes because of the salt and the humidity, so showers and laundry are gross and moldy. It's a great location if you want to fish at Bob Hall Pier, but it is decidedly grubby. And I'm not even talking about the used condom I found when I was picking up trash in the dunes beside the walkway to the beach.
Oh, wait. You also get a picnic table that can also be used as a weight bench for pumping iron by a guy whose souvenir t-shirt from Las Vegas says: "DRINK 'TIL SHE'S CUTE. STOP BEFORE THE WEDDING":
But they do have a proactive staff. When some people left their dog loose and went into town for dinner, and the dog was menacing and scaring people, I heard the guy in the office tell the animal control people, ""It bit someone on the face, but it didn't break the skin."
And unrelated to Padre Balli--you didn't mention when you're going. If it's after early/mid May, don't even think about boondocking because it will be too hot; you will have to have air conditioning, including at night. Notice the pop-up trailers have air conditioners.