I stayed at the Cal-Expo RV Campground for nine nights and found it to be accessible, friendly, efficient, and well equipped. Our fairly large group of 200+ units was accommodated with ease. Pets are welcome, on leash, and a Bark Park is provided for pets to play off leash. The Park is adjacent to the American River Pathway so hiking, biking, and birding are very close by. The restrooms and showers are clean work well. This isn't a back to nature experience, but if you are visiting for work or a convention it is much better than a hotel room.
This is an RV Resort past its prime. Many advertised sites are closed or no longer have the advertised utilities. The facilities are old and worn. Campsites are very littered with everything from clothing to discarded utensils to used condoms. Full time or part time residents have erected various structures on sites creating the look of a hobo jungle in areas. I wouldn't bring young children here.