South Carolina Carry has been contacted several times over the past year about no-carry signage at South Carolina State Parks and wording on their website stating the prohibition of concealed/open carry on state park premises. The board has been working on getting this situation resolved with the South Carolina Department of Parks, Recreation & Tourism. The issue was finally addressed by the South Carolina Attorney General's Office earlier this month. You can read the entire opinion at this link.
I haven't been able to check to see if the signs have been taken down, but their website has been updated with more accurate information that only property leased from the Army Corps of Engineers is off-limits (without written permission).