BillG,
I just read that they took Myrtle Beach off the closed list. Here's the quote from SCSP web site: "Due to cleanup and power outages from Hurricane Dorian, the following parks are CLOSED, as we work to get them ready for you: Edisto Beach State Park and Hunting Island State Park. Huntington Beach State Park beach access and day-use and the North Campground are OPEN. Atalaya, the South Campground, the Marsh Boardwalk, some shelters and trails remain closed."
So I'd say Myrtle Beach is open.