Charleston, SC is a marvelous walk around city with tons to see and do, including really good restuarants.
We have stayed in 3 coastal state parks, Myrtle Beach, Huntington Beach, (neare Myrtle Beach) and Hunting Island (near Beauford), and like them all. We like the area but it's not generally considered a wintering place like FL or the deep southwest. It can be cool if not down right cold, though nothing like the upper tier of the USA, definitely not a shorts and swimming place. I'd take it over NH but not FL (from Ginny).
Norm and Ginny
2014 Honda Odyssey
1991 Scamp 16