If you like the Myrtle Beach area, but don't want the crowds or "can't even open your awning" sites, then try Willow Tree campground in Longs.
It's about a 15 minute drive to the beach and all the action, but has huge sites, it's own fresh water lake and super-friendly staff.
I spent 2 weeks there this past October and would Highly recommend it.
https://willowtreervr.com/