We camped at Henderson Beach State Park the last week of 2020.  It was absolutely beautiful with well kept grounds and clean facilities.  The beach was amazing and our site was so private.  We were on D loop, and I would recommend loop A or B as first choice.   However, all sites are very private and level.   Only 2 bars on cell service and wi-fi is only available at visitor center and bathhouse.  Would definitely stay here again.