We just stayed 4 nights in Park Of The Sierras in Coarsegold, CA. We made a reservation a couple of months ago. It all went to plan. $26 a night for 50amp and the Best Wifi I've ever experienced in an RV park. Super friendly people. The clubhouse is very nice with a Boutique, Pool room, laundry, restrooms/showers, and a huge library, etc... We really enjoyed our visit there. The New Years eve bash was pretty good as well. Lots of planned activities.
There is a casino a few miles away with fuel prices well below the California average. Grocery stores not far away. Lots of restaurants.
The sites are big and level. The only issue is the windy roads if you have a long rig. Also I never seen so many golf carts outside of a golf course. LOL.
We will definitely go back but probably in a warmer time of the year.