Casa Grande has at least on we stayed in. Huge and well organized with lots to do. I think the name is Palm Desert. Take a look at it on line.
I think you are talking about Palm Creek Golf and RV Resort.
We have been there several times and it is one our favorite parks. Spent most of February there last winter. We really like the park. Great hiking and biking trails. The entrance to the park is only about 1/2 mile from the beach. We biked there several times. The sites are not close to each other. It is cooler than places further South but usually not real cold. During the winter it is full most of the time. They save some sites that can be rented for only two weeks at a time.