Many sites, good water access, but not a lot of shade or flat ground for tents. Affordable. Not the prettiest scenery in California, but a cheap and reliable way to get some quick nature. Allows dogs.
Acorn campground https://www.recreation.gov/camping/acorn-campground/r/campgroundDetails.do?contractCode=NRSO&parkId=73494 is a great campground for boaters, or anyone looking to camp near a lake. Located on New Hogan Reservoir, there are multiple boat ramps, and large sites, many of them right on the lake. Each site has a firepit, grill, picnic table, and a pole to hang lanterns on. The lake level varies wildly throughout the year, sites that are right on the lake can end up being hundreds of feet from the lake if the water level is low. Early summer is the best time to go for high lake levels. There is boating, fishing, water skiing, jet skiing, swimming etc available in the lake. Not much in the way of hiking in the immediate area, but there are some good hikes nearby outside of the campground. The restrooms and showers were very clean, although some campsites are located quite a long walk from them. Since it is so close to the Central Valley and easy to get to, it can get crowded and noisy, but otherwise it is a great site. The gold rush towns in the foothills are close by too, so that opens up more day time activities. There is a great little store called the Zippy Mart, located just outside the campground that sells bait, food, beer, firewood, etc, so if you forget something its easy to run there and pick it up.